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Coolant Hoses - Engine Bay
- Porsche Boxster 986 2.5L 1997-99
- Porsche Boxster 986 2.7L 1999-02
- Porsche Boxster S 986 3.2L 1999-02
- Porsche Boxster 986 2.7L 2003-04
- Porsche Boxster S 986 3.2L 2003-04
- Porsche Boxster 987 2.7L 2005-08/08
- Porsche Boxster 987 S 3.2/3.4L 2005-08/08
- Porsche Boxster 987 MKII 2.9L 2009-12
- Porsche Boxster S 987 MKII 3.4L 2009-12
- Porsche Boxster 981 2.7L 2012-16
- Porsche Boxster 981 S / GTS 3.4L 2012-16
- Porsche Boxster 981 Spyder 3.8L 2016
- Porsche Boxster 718 2.0L Manual (300 Bhp) 2017>>
- Porsche Boxster 718 2.0L PDK (300 Bhp) 2017>>
- Porsche Boxster S 718 2.5L Manual (350 Bhp) 05/2017>>
- Porsche Boxster S 718 2.5L PDK (350 Bhp) 05/2017>>
- Porsche Boxster T 718 2.0L Manual (300 Bhp) 01/2019>>
- Porsche Boxster T 718 2.0L PDK (300 Bhp) 01/2019>>
- Porsche Boxster GTS 718 2.5L Manual (365 Bhp) 05/2017>>
- Porsche Boxster GTS 718 2.5L PDK (365 Bhp) 05/2017>>
- Porsche Boxster GTS 718 4.0L Manual (400 Bhp) 01/2019>>
- Porsche Boxster GTS 718 4.0L PDK (400 Bhp) 01/2019>>
- Porsche Boxster Spyder / Spyder RS 718 4.0L 01/2019>>
- Porsche Boxster 25 Years 718 4.0L Manual (400 Bhp) 01/2020>>
- Porsche Boxster 25 Years 718 4.0L PDK (400 Bhp) 01/2020>>
- Porsche 996 TURBO 2000-05
- Porsche 996 GT2 2001-05
- Porsche 996 GT3 MKI 1999-02
- Porsche 996 GT3 MKII 2003>>
- Porsche 996 GT3 RS 2003-04
- Porsche 997 MK1 Carrera 2 3.6L 2005-08
- Porsche 997 MK1 Carrera 2S 3.8L 2005-08
- Porsche 997 MK1 Carrera 4 3.6L 2005-08
- Porsche 997 MK1 Carrera 4S 3.8L 2005-08
- Porsche 997 MK1 TURBO 2007-09
- Porsche 997 MK1 GT3 / GT3 RS 2007-09
- Porsche 997 MK1 GT2 2007-09
- Porsche 997 MKII Carrera C2 3.6L 2009-12
- Porsche 997 MKII Carrera C4 3.6L 2009-12
- Porsche 997 MKII Carrera C2S 3.8L 2009-12
- Porsche 997 MKII Carrera C4S 3.8L 2009-12
- Porsche 997 MKII GT3 / GT3 RS 2010-11
- Porsche 997 MKII Turbo 2010-13
- Porsche 997 MKII GT2 RS 2011-13
- Porsche 991.1 Carrera C2 3.4L (350 Bhp) 2012-16
- Porsche 991.1 Carrera C2S / GTS 3.8L (400/430 Bhp) 2012-16
- Porsche 991.1 Carrera C4 3.4L (350 Bhp) 2012-16
- Porsche 991.1 Carrera C4S / GTS 3.8L (400/430 Bhp) 2012-16
- Porsche 991.1 Turbo 3.8L (520 Bhp) 2014-16
- Porsche 991.1 Turbo S 3.8L (560 Bhp) 2014-16
- Porsche 991.1 R 4.0L (500 Bhp) 2016
- Porsche 991.1 GT3 3.8L (475 Bhp) 2014-16
- Porsche 991.1 GT3 RS 4.0L (500 Bhp) 2015-16
- Porsche 991.2 Carrera 2 3.0L (370 Bhp) 2016-19
- Porsche 991.2 Carrera 2S / GTS 3.0L (420/450 Bhp) 2016-19
- Porsche 991.2 Carrera 4 3.0L (370 Bhp) 2016-19
- Porsche 991.2 Carrera 4S / GTS 3.0L (420/450 Bhp) 2016-19
- Porsche 991.2 Cabriolet 2 3.0L (370 Bhp) 2016-19
- Porsche 991.2 Cabriolet 2S / GTS 3.0L (420/450 Bhp) 2016-19
- Porsche 991.2 Cabriolet 4 3.0L (370 Bhp) 2016-19
- Porsche 991.2 Cabriolet 4S / GTS 3.0L (420/450 Bhp) 2016-19
- Porsche 991.2 Targa 4 3.0L (370 Bhp) 2016-19
- Porsche 991.2 Targa 4S / GTS 3.0L (420/450 Bhp) 2016-19
- Porsche 991.2 Turbo Coupe 3.8L (540 Bhp) 2016-19
- Porsche 991.2 Turbo S Coupe 3.8L (580 Bhp) 2016-19
- Porsche 991.2 Turbo Cabriolet 3.8L (540 Bhp) 2016-19
- Porsche 991.2 Turbo S Cabriolet 3.8L (580 Bhp) 2016-19
- Porsche 991.2 Speedster 4.0L (510Bhp) 2019
- Porsche 991.2 GT3 4.0L (500 Bhp) / GT3 RS 4.0L (520 Bhp) 2017-19
- Porsche 991.2 GT2 RS 3.8L PDK (700 bhp) 2018-19
- Porsche Cayman 2.7L 987C 2006-08
- Porsche Cayman S 3.4L 987C 2005-08
- Porsche Cayman 2.9L 987C MKII 2009-12
- Porsche Cayman S / R 3.4L 987C MKII 2009-12
- Porsche Cayman 2.7L 981 2013-16
- Porsche Cayman S / GTS 3.4L 981 2013-16
- Porsche Cayman GT4 3.8L 2015-16
- Porsche Cayman 718 2.0L Manual (300 Bhp)
- Porsche Cayman 718 2.0L PDK (300 Bhp)
- Porsche Cayman S 718 2.5L Manual (350 Bhp)
- Porsche Cayman S 718 2.5L PDK (350 Bhp)
- Porsche Cayman T 718 2.0L Manual (300 Bhp)
- Porsche Cayman T 718 2.0L PDK (300 Bhp)
- Porsche Cayman GTS 718 2.5L Manual (365 Bhp)
- Porsche Cayman GTS 718 2.5L PDK (365 Bhp)
- Porsche Cayman GTS 718 4.0L Manual (400 Bhp)
- Porsche Cayman GTS 718 4.0L PDK (400 Bhp)
- Porsche Cayman GT4 718 4.0L / GT4 RS 718 4.0L
Fits:
Porsche 987 Boxster 2005-12
Porsche 987 Cayman 2006-12
Porsche 981 Boxster 2012-16
Porsche 981 Boxster Spyder 2016
Porsche 981 Cayman 2014-16
Porsche 981 Cayman GT4 2016
Porsche 718 (982) Boxster 2017>>
Porsche 718 (982) Boxster Spyder 2019>>
Porsche 718 (982) Cayman 2017>>
Porsche 718 (982) Cayman GT4 2019>>
Porsche 996 GT3 / RS 1999-05
Porsche 996 Turbo / GT2 2001-05
Porsche 997 Carrera 2005-12
Porsche 997 Turbo / GT2 RS 2007-13
Porsche 997 GT3 / RS 2007-11
Porsche 991 Carrera 2012-19
Porsche 991 Turbo / GT2 RS 2014-20
Porsche 991 GT3 / RS 2014-21
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99610680103
The product you are viewing cross references to these numbers
- Porsche Boxster 986 2.5L 1997-99
- Porsche Boxster 986 2.7L 1999-02
- Porsche Boxster S 986 3.2L 1999-02
- Porsche Boxster 986 2.7L 2003-04
- Porsche Boxster S 986 3.2L 2003-04
- Porsche Boxster 987 2.7L 2005-08/08
- Porsche Boxster 987 S 3.2/3.4L 2005-08/08
- Porsche Boxster 987 MKII 2.9L 2009-12
- Porsche Boxster S 987 MKII 3.4L 2009-12
- Porsche Boxster 981 2.7L 2012-16
- Porsche Boxster 981 S / GTS 3.4L 2012-16
- Porsche Boxster 981 Spyder 3.8L 2016
- Porsche Boxster 718 2.0L Manual (300 Bhp) 2017>>
- Porsche Boxster 718 2.0L PDK (300 Bhp) 2017>>
- Porsche Boxster S 718 2.5L Manual (350 Bhp) 05/2017>>
- Porsche Boxster S 718 2.5L PDK (350 Bhp) 05/2017>>
- Porsche Boxster T 718 2.0L Manual (300 Bhp) 01/2019>>
- Porsche Boxster T 718 2.0L PDK (300 Bhp) 01/2019>>
- Porsche Boxster GTS 718 2.5L Manual (365 Bhp) 05/2017>>
- Porsche Boxster GTS 718 2.5L PDK (365 Bhp) 05/2017>>
- Porsche Boxster GTS 718 4.0L Manual (400 Bhp) 01/2019>>
- Porsche Boxster GTS 718 4.0L PDK (400 Bhp) 01/2019>>
- Porsche Boxster Spyder / Spyder RS 718 4.0L 01/2019>>
- Porsche Boxster 25 Years 718 4.0L Manual (400 Bhp) 01/2020>>
- Porsche Boxster 25 Years 718 4.0L PDK (400 Bhp) 01/2020>>
- Porsche 996 TURBO 2000-05
- Porsche 996 GT2 2001-05
- Porsche 996 GT3 MKI 1999-02
- Porsche 996 GT3 MKII 2003>>
- Porsche 996 GT3 RS 2003-04
- Porsche 997 MK1 Carrera 2 3.6L 2005-08
- Porsche 997 MK1 Carrera 2S 3.8L 2005-08
- Porsche 997 MK1 Carrera 4 3.6L 2005-08
- Porsche 997 MK1 Carrera 4S 3.8L 2005-08
- Porsche 997 MK1 TURBO 2007-09
- Porsche 997 MK1 GT3 / GT3 RS 2007-09
- Porsche 997 MK1 GT2 2007-09
- Porsche 997 MKII Carrera C2 3.6L 2009-12
- Porsche 997 MKII Carrera C4 3.6L 2009-12
- Porsche 997 MKII Carrera C2S 3.8L 2009-12
- Porsche 997 MKII Carrera C4S 3.8L 2009-12
- Porsche 997 MKII GT3 / GT3 RS 2010-11
- Porsche 997 MKII Turbo 2010-13
- Porsche 997 MKII GT2 RS 2011-13
- Porsche 991.1 Carrera C2 3.4L (350 Bhp) 2012-16
- Porsche 991.1 Carrera C2S / GTS 3.8L (400/430 Bhp) 2012-16
- Porsche 991.1 Carrera C4 3.4L (350 Bhp) 2012-16
- Porsche 991.1 Carrera C4S / GTS 3.8L (400/430 Bhp) 2012-16
- Porsche 991.1 Turbo 3.8L (520 Bhp) 2014-16
- Porsche 991.1 Turbo S 3.8L (560 Bhp) 2014-16
- Porsche 991.1 R 4.0L (500 Bhp) 2016
- Porsche 991.1 GT3 3.8L (475 Bhp) 2014-16
- Porsche 991.1 GT3 RS 4.0L (500 Bhp) 2015-16
- Porsche 991.2 Carrera 2 3.0L (370 Bhp) 2016-19
- Porsche 991.2 Carrera 2S / GTS 3.0L (420/450 Bhp) 2016-19
- Porsche 991.2 Carrera 4 3.0L (370 Bhp) 2016-19
- Porsche 991.2 Carrera 4S / GTS 3.0L (420/450 Bhp) 2016-19
- Porsche 991.2 Cabriolet 2 3.0L (370 Bhp) 2016-19
- Porsche 991.2 Cabriolet 2S / GTS 3.0L (420/450 Bhp) 2016-19
- Porsche 991.2 Cabriolet 4 3.0L (370 Bhp) 2016-19
- Porsche 991.2 Cabriolet 4S / GTS 3.0L (420/450 Bhp) 2016-19
- Porsche 991.2 Targa 4 3.0L (370 Bhp) 2016-19
- Porsche 991.2 Targa 4S / GTS 3.0L (420/450 Bhp) 2016-19
- Porsche 991.2 Turbo Coupe 3.8L (540 Bhp) 2016-19
- Porsche 991.2 Turbo S Coupe 3.8L (580 Bhp) 2016-19
- Porsche 991.2 Turbo Cabriolet 3.8L (540 Bhp) 2016-19
- Porsche 991.2 Turbo S Cabriolet 3.8L (580 Bhp) 2016-19
- Porsche 991.2 Speedster 4.0L (510Bhp) 2019
- Porsche 991.2 GT3 4.0L (500 Bhp) / GT3 RS 4.0L (520 Bhp) 2017-19
- Porsche 991.2 GT2 RS 3.8L PDK (700 bhp) 2018-19
- Porsche Cayman 2.7L 987C 2006-08
- Porsche Cayman S 3.4L 987C 2005-08
- Porsche Cayman 2.9L 987C MKII 2009-12
- Porsche Cayman S / R 3.4L 987C MKII 2009-12
- Porsche Cayman 2.7L 981 2013-16
- Porsche Cayman S / GTS 3.4L 981 2013-16
- Porsche Cayman GT4 3.8L 2015-16
- Porsche Cayman 718 2.0L Manual (300 Bhp)
- Porsche Cayman 718 2.0L PDK (300 Bhp)
- Porsche Cayman S 718 2.5L Manual (350 Bhp)
- Porsche Cayman S 718 2.5L PDK (350 Bhp)
- Porsche Cayman T 718 2.0L Manual (300 Bhp)
- Porsche Cayman T 718 2.0L PDK (300 Bhp)
- Porsche Cayman GTS 718 2.5L Manual (365 Bhp)
- Porsche Cayman GTS 718 2.5L PDK (365 Bhp)
- Porsche Cayman GTS 718 4.0L Manual (400 Bhp)
- Porsche Cayman GTS 718 4.0L PDK (400 Bhp)
- Porsche Cayman GT4 718 4.0L / GT4 RS 718 4.0L
Fits:
Porsche 987 Boxster 2005-12
Porsche 987 Cayman 2006-12
Porsche 981 Boxster 2012-16
Porsche 981 Boxster Spyder 2016
Porsche 981 Cayman 2014-16
Porsche 981 Cayman GT4 2016
Porsche 718 (982) Boxster 2017>>
Porsche 718 (982) Boxster Spyder 2019>>
Porsche 718 (982) Cayman 2017>>
Porsche 718 (982) Cayman GT4 2019>>
Porsche 996 GT3 / RS 1999-05
Porsche 996 Turbo / GT2 2001-05
Porsche 997 Carrera 2005-12
Porsche 997 Turbo / GT2 RS 2007-13
Porsche 997 GT3 / RS 2007-11
Porsche 991 Carrera 2012-19
Porsche 991 Turbo / GT2 RS 2014-20
Porsche 991 GT3 / RS 2014-21
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99610680103
The product you are viewing cross references to these numbers
- Porsche 996 TURBO 2000-05
- Porsche 996 GT2 2001-05
- Porsche 996 GT3 MKI 1999-02
- Porsche 996 GT3 MKII 2003>>
- Porsche 997 MK1 TURBO 2007-09
- Porsche 997 MK1 GT3 / GT3 RS 2007-09
- Porsche 997 MK1 GT2 2007-09
- Porsche 997 MKII GT3 / GT3 RS 2010-11
- Porsche 997 MKII Turbo 2010-13
- Porsche 997 MKII GT2 RS 2011-13
Sold Each.
x2 Required Per Car.
Fits:
Porsche 996 Turbo / GT2 2001>>2005
Porsche 996 GT3 1999>>2005
Porsche 997.1 Turbo / GT2 MKI 2007>>2009
Porsche 997.1 GT3 MKI 2007>>2009
Porsche 997.2 Turbo / GT2 RS MKII 2010>>2013
Porsche 997.2 GT3 MKII 2010>>2011
Diagram Ref No 16
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99610621470
The product you are viewing cross references to these numbers
- Porsche 997 MK1 TURBO 2007-09
- Porsche 997 MK1 GT3 / GT3 RS 2007-09
- Porsche 997 MK1 GT2 2007-09
- Porsche 997 MKII GT3 / GT3 RS 2010-11
- Porsche 997 MKII GT2 RS 2011-13
Fits:
Porsche 997.1 turbo - 2007 to 2008
Porsche 997.2 GT2 - 2001 to 2012
Porsche 997 GT3 - 2007 to 2012
Click 'Zoom in' for large parts diagram.
Diagram ref no 2 or 45
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99710632872
The product you are viewing cross references to these numbers
- Porsche 997 MK1 Carrera 2 3.6L 2005-08
- Porsche 997 MK1 Carrera 2S 3.8L 2005-08
- Porsche 997 MK1 Carrera 4 3.6L 2005-08
- Porsche 997 MK1 Carrera 4S 3.8L 2005-08
- Porsche 997 MK1 TURBO 2007-09
Fits:
Porsche 997.1 Carrera 3.6 / 3.8L 2005-08*
Porsche 997.1 Turbo 2007-09*
*for cars with Tiptronic transmission (option I249)
Click 'Zoom in' for large parts diagram.
Diagram ref no 3
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99710674205
The product you are viewing cross references to these numbers
- Porsche 997 MK1 Carrera 2 3.6L 2005-08
- Porsche 997 MK1 Carrera 2S 3.8L 2005-08
- Porsche 997 MK1 Carrera 4 3.6L 2005-08
- Porsche 997 MK1 Carrera 4S 3.8L 2005-08
- Porsche 997 MKII Carrera C2 3.6L 2009-12
- Porsche 997 MKII Carrera C4 3.6L 2009-12
- Porsche 997 MKII Carrera C2S 3.8L 2009-12
- Porsche 997 MKII Carrera C4S 3.8L 2009-12
Fits:
Porsche 997.1 2007-09*
Porsche 997.2 2010-13*
*for cars with 6-speed Manual transmission (option I480)
Click 'Zoom in' for large parts diagram.
Diagram ref no 2
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99710674106
The product you are viewing cross references to these numbers
- Porsche 997 MK1 TURBO 2007-09
- Porsche 997 MKII Turbo 2010-13
Fits:
Porsche 997.1 GT2 / GT3/RS MKI 2005>>2008
Porsche 997.2 GT2/RS / GT3/RS MKII 2009>>2012
Diagram Ref No 3
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99710688996
The product you are viewing cross references to these numbers
- Porsche 997 MK1 TURBO 2007-09
- Porsche 997 MKII Turbo 2010-13
Fits:
Porsche 997.1 Turbo 2007-09*
Porsche 997.2 Turbo 2010-13*
*for cars with 6-speed Manual transmission (option I480), not for GT2/GT3
Click 'Zoom in' for large parts diagram.
Diagram ref no 2
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99710674107
The product you are viewing cross references to these numbers
- Porsche 997 MK1 Carrera 2 3.6L 2005-08
- Porsche 997 MK1 Carrera 2S 3.8L 2005-08
- Porsche 997 MK1 Carrera 4 3.6L 2005-08
- Porsche 997 MK1 Carrera 4S 3.8L 2005-08
- Porsche 997 MK1 TURBO 2007-09
- Porsche 997 MK1 GT3 / GT3 RS 2007-09
- Porsche 997 MK1 GT2 2007-09
- Porsche 997 MKII Carrera C2 3.6L 2009-12
- Porsche 997 MKII Carrera C4 3.6L 2009-12
- Porsche 997 MKII Carrera C2S 3.8L 2009-12
- Porsche 997 MKII Carrera C4S 3.8L 2009-12
- Porsche 997 MKII GT3 / GT3 RS 2010-11
- Porsche 997 MKII Turbo 2010-13
- Porsche 997 MKII GT2 RS 2011-13
This original Porsche coolant hose forms part of the engine cooling system, helping route coolant through the supply side of the cooling circuit and maintain correct engine temperature control.
Fits:
Porsche 997.1 2005 - 2008
Porsche 997.2 2009 - 2012
Diagram ref no 17
This hose is used in the water cooling system on selected Porsche 997 models.
What This Part Does / Functions:
• Routes coolant through the supply side of the engine cooling system
• Helps maintain correct coolant flow and operating temperature
• Connects specified cooling system components where fitted
• Helps prevent coolant loss when correctly sealed and installed
• Replaces a cracked, swollen, leaking or heat-damaged original hose
• Provides correct OE Porsche hose shape, material and connection fitment
• Supports reliable cooling system operation.
Why Replace This Part?
Coolant hoses are exposed to heat cycles, coolant pressure, engine bay temperatures, vibration and age-related rubber deterioration. Over time, the hose can harden, swell, crack, split or leak. A failing coolant supply hose may cause coolant loss, low coolant warnings, overheating risk or visible coolant residue around the hose connections.
Replacing it with an OE Genuine Porsche water coolant supply hose helps restore the correct factory coolant routing and reliable cooling system sealing.
Common Symptoms of a Faulty Coolant Supply Hose
• Coolant leak from the hose or hose connections
• Dried coolant residue around the cooling system
• Low coolant warning
• Coolant smell from the engine bay
• Engine temperature rising above normal
• Hose swelling, cracking or softening
• Coolant pressure loss
• Damage found during cooling system inspection.
When to Replace This Part
• If the original coolant hose is cracked, swollen, leaking or damaged
• During cooling system overhaul
• When replacing related coolant pipes, water pump, thermostat or radiator components
• If coolant loss is traced to this hose
• After engine bay service where the hose has been disturbed
• If the hose has become brittle or oil-contaminated
• During preventative maintenance on older cooling systems
• When restoring the cooling system with OE Genuine Porsche parts.
Where It Fits on the Car
This hose fits in the engine cooling / water cooling system of the Porsche 997. It is identified as a supply-side coolant hose and is shown in Porsche cooling diagrams as diagram reference no. 17.
Correct routing, clamp positioning and sealing are important to prevent coolant leaks and maintain proper cooling system operation.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99710674006
The product you are viewing cross references to these numbers
- Porsche 997 MK1 Carrera 2 3.6L 2005-08
- Porsche 997 MK1 Carrera 2S 3.8L 2005-08
- Porsche 997 MK1 Carrera 4 3.6L 2005-08
- Porsche 997 MK1 Carrera 4S 3.8L 2005-08
- Porsche 997 MK1 TURBO 2007-09
- Porsche 997 MK1 GT3 / GT3 RS 2007-09
- Porsche 997 MK1 GT2 2007-09
- Porsche 997 MKII Carrera C2 3.6L 2009-12
- Porsche 997 MKII Carrera C4 3.6L 2009-12
- Porsche 997 MKII Carrera C2S 3.8L 2009-12
- Porsche 997 MKII Carrera C4S 3.8L 2009-12
- Porsche 997 MKII GT3 / GT3 RS 2010-11
- Porsche 997 MKII Turbo 2010-13
- Porsche 997 MKII GT2 RS 2011-13
Water coolant hose, supply
OE Match coolant supply hose for selected Porsche 997.1 and 997.2 models. This replacement carries coolant along the supply circuit and provides an alternative to the original Porsche component.
Fits:
Porsche 997.1 2005 - 2008
Porsche 997.2 2009 - 2012
Diagram ref no 17
What This Product Does
The hose joins designated connections within the water-cooling supply circuit. Its role is to carry coolant between those connections, supporting circulation and temperature management. OE Match develops replacement components around Porsche applications, with specification review and sample evaluation forming part of its approval process.
Functions
- Carries coolant along the designated supply route.
- Links the relevant cooling-circuit connections.
- Supports a sealed fluid path when properly fitted.
Technical Details
- Brand: OE Match
- Component: coolant supply hose.
- Supplied part reference: 99710674006
- Additional catalogue references: 99710674004 and 99710674005.
Symptoms of Fault
- Wetness or seepage at either connection.
- A falling coolant level or dashboard level alert.
- A sweet smell or deposits near the hose.
- Temperature readings higher than usual.
- Bulging, splits, hardened areas or unusually soft sections.
- Gurgling associated with low coolant or trapped air.
Why Replacement Matters
Repeated heating and cooling, pressure, vibration and contamination can weaken a hose over time. Renew it when inspection confirms deterioration or identifies it as the leak source. A small seep can develop into substantial fluid loss, so investigate recurring level drops rather than relying on repeated top-ups.
During related cooling repairs, inspect adjoining pipes, fittings, retainers and seals. Check the hose routing and connection security, then refill and bleed according to the vehicle-specific procedure.
FAQs
How should a suspected leak be confirmed?
A cooling-system pressure test and inspection of the hose connections can help distinguish hose leakage from nearby component faults.
Can coolant collect without leaving a puddle?
Yes. Fluid may collect on an undertray or evaporate, leaving deposits rather than obvious drips.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99710674006
The product you are viewing cross references to these numbers
- Porsche 996 TURBO 2000-05
- Porsche 996 GT2 2001-05
- Porsche 996 GT3 MKI 1999-02
- Porsche 996 GT3 MKII 2003>>
- Porsche 996 GT3 RS 2003-04
- Porsche 997 MK1 TURBO 2007-09
Fits:
Porsche 996 turbo - 2000 to 2005
Porsche 996 GT3 - 1999 to 2005
Porsche 997.1 turbo - 2007 to 2008
Click 'Zoom in' for large parts diagram.
Diagram ref no 6
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99610632272
The product you are viewing cross references to these numbers
- Porsche 996 TURBO 2000-05
- Porsche 996 GT2 2001-05
- Porsche 996 GT3 MKI 1999-02
- Porsche 996 GT3 MKII 2003>>
- Porsche 996 GT3 RS 2003-04
- Porsche 997 MK1 TURBO 2007-09
Fits:
Porsche 996 turbo - 2000 to 2005
Porsche 996 GT3 - 1999 to 2005
Porsche 997.1 turbo - 2007 to 2008
Click 'Zoom in' for large parts diagram.
Diagram ref no 5
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99610631272
The product you are viewing cross references to these numbers
- Porsche 997 MK1 Carrera 2 3.6L 2005-08
- Porsche 997 MK1 Carrera 2S 3.8L 2005-08
- Porsche 997 MK1 Carrera 4 3.6L 2005-08
- Porsche 997 MK1 Carrera 4S 3.8L 2005-08
- Porsche 997 MK1 TURBO 2007-09
- Porsche 997 MK1 GT3 / GT3 RS 2007-09
- Porsche 997 MK1 GT2 2007-09
- Porsche 997 MKII Carrera C2 3.6L 2009-12
- Porsche 997 MKII Carrera C4 3.6L 2009-12
- Porsche 997 MKII Carrera C2S 3.8L 2009-12
- Porsche 997 MKII Carrera C4S 3.8L 2009-12
- Porsche 997 MKII GT3 / GT3 RS 2010-11
- Porsche 997 MKII Turbo 2010-13
- Porsche 997 MKII GT2 RS 2011-13
Water Coolant Pipe, Supply.
Fits:
Porsche 997.1 2005-08
Porsche 997.2 2009-12
Click 'Zoom in' for large parts diagram.
Diagram ref no 1
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99710661032
The product you are viewing cross references to these numbers
- Porsche 996 C2 3.6L 09/01-2005
- Porsche 996 C4 3.6L 09/01-2005
- Porsche 996 C4S 3.6L 09/01-2005
- Porsche 997 MK1 Carrera 2 3.6L 2005-08
- Porsche 997 MK1 Carrera 2S 3.8L 2005-08
- Porsche 997 MK1 Carrera 4 3.6L 2005-08
- Porsche 997 MK1 Carrera 4S 3.8L 2005-08
The Porsche Water Hose Return Line 99610682204 is a genuine Porsche replacement coolant hose used within the engine cooling circuit on selected Porsche 996 and 997 models.
Fits:
- Porsche 996 C2 3.6L 2002-2005
- Porsche 996 C4 3.6L 2002-2005
- Porsche 996 C4S 3.6L 2002-2005
- Porsche 997 MK1 Carrera 2 3.6L 2005-08
- Porsche 997 MK1 Carrera 2S 3.8L 2005-08
- Porsche 997 MK1 Carrera 4 3.6L 2005-08
- Porsche 997 MK1 Carrera 4S 3.8L 2005-08
Diagram Ref No 33
The hose forms part of the coolant return side of the system, carrying coolant back through the cooling circuit after it has passed through associated engine, radiator or heating-system components.
Maintaining this hose in good condition is essential because the Porsche cooling system operates under pressure and relies on a completely sealed circuit to maintain stable engine temperature.
This Genuine Porsche replacement provides the correct factory-style dimensions, connections and routing for the intended application.
What This Product Does:
The return hose carries coolant through the return side of the vehicle's liquid-cooling system.
Its main functions include:
- Carrying coolant through the return circuit
- Maintaining continuous coolant circulation
- Helping maintain correct cooling-system pressure
- Returning coolant toward the engine or associated cooling circuit
- Supporting stable engine operating temperature
- Preventing coolant loss when correctly sealed
- Maintaining the original Porsche coolant routing
- Connecting adjoining coolant pipes and cooling-system components
The hose works together with the supply hose, coolant pipes, water pump, thermostat and radiators to maintain controlled coolant circulation.
Symptoms Of Wear Or Failure:
Coolant hoses deteriorate over time because of heat, pressure, vibration and repeated thermal cycling.
Common symptoms include:
- Visible coolant leakage
- Wetness around the hose or connections
- Pink, white or crusty coolant residue
- Falling coolant level
- Frequent coolant top-ups
- Low coolant warning
- Sweet coolant smell
- Cracks in the hose surface
- Hardened or brittle rubber
- Swollen or unusually soft hose sections
- Bulging under pressure
- Damaged hose ends
- Leakage around clamps or joints
- Fluctuating coolant temperature
- Engine running hotter than normal
- Steam or coolant vapour after driving
- Engine overheating
A small leak may only appear when the engine is fully warm and the cooling system is pressurised.
Why Replacement Matters:
A deteriorated coolant return hose can fail gradually through seepage or suddenly through a split or rupture.
Loss of coolant can quickly compromise the engine's ability to control temperature.
Continued driving with a leaking hose can result in:
- Cooling-system pressure loss
- Reduced coolant circulation
- Air entering the cooling system
- Engine overheating
- Poor heater performance
- Coolant warning messages
- Roadside breakdown
- Serious engine damage if overheating is allowed to continue
Replacing a worn hose helps restore a sealed cooling circuit and reliable coolant circulation.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99610682204
The product you are viewing cross references to these numbers
- Porsche 997 MK1 TURBO 2007-09
- Porsche 997 MK1 GT3 / GT3 RS 2007-09
- Porsche 997 MK1 GT2 2007-09
- Porsche 997 MKII GT3 / GT3 RS 2010-11
- Porsche 997 MKII Turbo 2010-13
- Porsche 997 MKII GT2 RS 2011-13
The Porsche Water Hose Supply 99710650101 is a genuine replacement coolant supply hose designed for selected Porsche 997 performance models.
Fits:
- Porsche 997 MK1 TURBO 2007-09
- Porsche 997 MK1 GT3 / GT3 RS 2007-09
- Porsche 997 MK1 GT2 2007-09
- Porsche 997 MKII GT3 / GT3 RS 2010-11
- Porsche 997 MKII Turbo 2010-13
- Porsche 997 MKII GT2 RS 2011-13
Diagram Ref No 9
Located on the right-hand side of the engine cooling circuit, the hose carries coolant from the supply pipe towards the engine, helping maintain continuous coolant circulation and stable operating temperatures.
Manufactured to Porsche specifications, this replacement restores the original hose routing, connections and sealing arrangement when the existing hose has become cracked, hardened, swollen or is leaking.
What This Product Does:
The engine cooling system continuously circulates coolant through the engine, radiators and associated pipework to absorb and dissipate heat.
This supply hose forms part of that circulation path and delivers coolant from the supply pipe into the engine cooling circuit.
Its main functions include:
- Carrying coolant towards the engine
- Maintaining continuous coolant circulation
- Helping maintain correct cooling-system pressure
- Supporting stable engine operating temperatures
- Providing a sealed connection between the coolant pipe and engine
- Helping prevent coolant loss
- Maintaining the original factory hose routing
- Supporting effective engine thermal management
The hose itself does not lower coolant temperature, but reliable coolant flow through it is essential for the cooling system to function correctly.
Symptoms Of Wear Or Failure:
Coolant hoses operate under continuous heat and pressure and can deteriorate as they age.
Common symptoms of a worn or failing coolant supply hose include:
- Visible coolant leakage
- Dampness around the hose or fittings
- Dried coolant residue around connection points
- Cracks or splits in the hose
- Rubber becoming hard or brittle
- Swelling or bulging sections
- Hose becoming excessively soft or spongy
- Damaged or loose hose connections
- Low coolant warning
- Repeated need to top up coolant
- Sweet coolant smell around the engine bay
- Engine temperature rising above normal
- Fluctuating coolant temperature
- Steam from the engine compartment in severe cases
Cooling-system leaks can also originate from radiators, expansion tanks, water pumps, pipe connections or other hoses, so the complete circuit should be inspected.
Why Replacement Matters:
The cooling system must remain sealed and properly pressurised to control engine temperature effectively.
If the supply hose begins to leak, coolant can escape and the system may gradually lose both fluid and pressure. As the coolant level falls, the engine becomes less able to transfer and dissipate heat.
A deteriorated hose may also split suddenly under operating pressure, causing rapid coolant loss.
Continued operation with insufficient coolant can lead to:
- Engine overheating
- Cylinder-head damage
- Head-gasket damage
- Damage to seals and cooling-system components
- Reduced engine reliability
- Breakdown caused by sudden coolant loss
Replacing a deteriorated hose helps restore:
- Correct coolant circulation
- Proper cooling-system pressure
- A sealed cooling circuit
- Stable engine temperature
- Reliable long-term cooling-system operation
Replacing a hose at the first sign of leakage, cracking or swelling can help prevent a relatively minor cooling-system fault from becoming a much more expensive engine repair.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99710650101
The product you are viewing cross references to these numbers
- Porsche 997 MK1 TURBO 2007-09
The Genuine Porsche Water Hose – Return is a replacement engine cooling-system hose for selected Porsche 911 997 Turbo models.
Fits:
- Porsche 997 MK1 TURBO 2007-09
Diagram Ref No 2
This hose forms part of the pressurised liquid-cooling circuit and carries coolant between the engine and the water-pump return pipe. Its job is to maintain a reliable, sealed route for coolant returning through the engine cooling system so that heat can be transferred away from the engine and dissipated through the radiators.
Because the hose operates continuously in a hot, pressurised environment, it is exposed to repeated thermal cycling, coolant chemicals, engine vibration and ageing. Over time, the rubber can harden, crack, swell or begin leaking around its connections.
Replacing a deteriorated return hose helps restore a sealed cooling circuit, maintain correct coolant circulation and reduce the risk of coolant loss and engine overheating.
What This Product Does:
The return hose carries engine coolant through the cooling system towards the water-pump return circuit.
It is designed to:
- Carry coolant between the engine and water-pump return pipe.
- Maintain continuous coolant circulation.
- Keep the cooling circuit sealed.
- Withstand cooling-system pressure.
- Withstand repeated high-temperature operation.
- Allow controlled movement between connected engine components.
- Help maintain stable engine temperature.
- Replace a leaking, cracked or hardened original hose.
- Prevent unnecessary coolant loss.
Symptoms Of Wear Or Failure:
Possible symptoms include:
- Visible coolant leakage.
- Coolant dripping beneath the vehicle.
- Dampness around the hose.
- Pink, white or coloured dried coolant residue.
- Coolant smell around the engine compartment.
- Gradual coolant-level loss.
- Coolant warning message.
- Hose becoming hard or brittle.
- Visible cracking.
- Swollen rubber.
- Soft or spongy hose sections.
- Leakage around hose connections.
- Steam from the engine area.
- Rising engine temperature.
- Temperature fluctuations.
- Cooling system requiring frequent topping up.
Why Replacement Matters:
Replacing a deteriorated return hose helps restore:
- Correct coolant circulation.
- Cooling-system sealing.
- Stable coolant level.
- Reliable water-pump return flow.
- Correct system pressure.
- Reduced risk of coolant loss.
- Stable engine operating temperature.
- Long-term cooling-system reliability.
Preventative replacement can be particularly worthwhile when other cooling-system work is already being carried out.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99710632972
The product you are viewing cross references to these numbers
-
water pump and thermostat housing for 997.1 M96.05 3.6L COUPE / CABRIO and 997.1 M97.01 3.8L COUPE S / CABRIO S 2005-08 105-00
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water cooling - 1 - for 997.1 M96.05 3.6L COUPE / CABRIO and 997.1 M97.01 3.8L COUPE S / CABRIO S 2005-08 105-05
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water cooling - 2 - for 997.1 M96.05 3.6L COUPE / CABRIO and 997.1 M97.01 3.8L COUPE S / CABRIO S 2005-08 105-10
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belt tensioner and belt drive for 997.1 TURBO/GT2 M97.70 2007-09 and 997.1 GT2 RS M97.70 2011 101-15
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water pump, water pump housing for 997.1 TURBO/GT2 M97.70 2007-09 and 997.1 GT2 RS M97.70 2011 105-00
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lines heating GT2 for 997.1 GT2 M97.70 I101 (Special GT2 engine parts) 2007-09 105-04
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water cooling - 1 - for 997.1 TURBO 2007-09 105-05
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belt tensioner and belt drive 997 GT3 M97.76 2007-09 101-15
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belt tensioner and belt drive 997 GT3 / GT3 RS M97.77 2010-11 and 997 GT3 RS 4.0 M97.74 2011 101-16
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oil filter, bracket 997 GT3 M97.76 2007-09 104-10
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oil filter, bracket 997 GT3 / GT3 RS M97.77 2010-11 and 997 GT3 RS 4.0 M97.74 2011 104-11
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water cooling - 1 - for 997 GT3 / GT3 RS M97.77 2010-11 and 997 GT3 RS 4.0 M97.74 2011 105-06
Coolant Hoses – Engine Bay | Reliable Cooling for Peak Porsche Performance
Coolant hoses in the engine bay are critical components that circulate coolant between the radiator, water pump, and engine block — maintaining consistent operating temperatures and preventing overheating. These hoses carry coolant through high-pressure, high-temperature zones within the engine bay, ensuring your Porsche performs at its best, even under demanding conditions.
At Design911, we stock a wide range of genuine and manufacturer-quality engine bay coolant hoses for Porsche models including 911, Boxster, Cayman. Each hose is designed to fit perfectly, resist extreme temperatures, and deliver long-lasting performance — matching the quality, precision and reliability.
What Do Engine Bay Coolant Hoses Do?
Coolant hoses form part of your Porsche’s closed-loop
cooling system. Their job is to:
- Circulate
coolant between the engine, radiator, and water pump.
- Maintain
engine temperature for optimal performance and emissions.
- Support
consistent coolant pressure during operation.
- Prevent engine overheating and protect internal components from heat damage.
In high-performance engines, such as those found in Porsche vehicles, properly functioning hoses are essential for ensuring precise temperature control and long-term mechanical integrity.
Why Do Engine Bay Coolant Hoses Fail?
Over time, coolant hoses endure constant exposure to heat,
vibration, and pressure, which can cause wear and eventual failure. Common
causes include:
- Rubber
deterioration from heat cycling and coolant chemicals.
- Cracking
or hardening due to age and environmental factors.
- Swelling
or soft spots from internal coolant corrosion.
- Leaks
at connections caused by weakened hose ends or clamps.
- Abrasion or rubbing against other engine components.
Symptoms of failure include coolant leaks, overheating, fluctuating temperature readings, or a noticeable smell of coolant in the engine bay.
Why Replace Faulty Coolant Hoses?
A damaged or leaking hose can cause rapid coolant loss and severe engine overheating. Replacing worn hoses ensures your Porsche’s cooling system functions reliably and efficiently.
Benefits of replacement include:
- Restored coolant circulation and temperature control.
- Prevention of leaks, overheating, and potential engine damage.
- Improved reliability and performance under all driving conditions.
- Manufacturer-quality construction and perfect fitment.
All hoses in this range are built using reinforced, high-grade rubber compounds designed to withstand extreme heat, pressure, and vibration — ensuring lasting durability and peace of mind.
