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Porsche // Boxster 986/987/981 (1997-2016) // Boxster 986 2.7L 1999-02
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- Porsche 997 MKII GT3 / GT3 RS 2010-11
Coolant Hose
Maintain the exceptional reliability and cooling performance of your Porsche with this Water Coolant Hose. Manufactured to Porsche's exact original equipment standards, this factory-original coolant hose ensures efficient coolant circulation, precise fitment and long-lasting durability, helping to keep your high-performance Mezger engine operating at its optimum temperature.
Fits:
- Porsche 997 MKII GT3 / GT3 RS 2010-11
Diagram ref no 24
The Porsche 997 GT3 is engineered for both road and track use, placing significant demands on its cooling system. Every coolant hose plays a critical role in transporting coolant between the engine, radiator and associated cooling components. A deteriorated or leaking hose can lead to coolant loss, increased engine temperatures and potentially severe engine damage if left unattended.
Whether you're carrying out routine maintenance, replacing ageing cooling system components or rebuilding your GT3 engine, choosing a Genuine Porsche coolant hose guarantees the correct materials, dimensions and performance specified by Porsche.
What Does the Water Coolant Hose Do?
The coolant hose forms part of the engine's closed cooling circuit, allowing coolant to circulate between the engine, radiator and associated cooling components.
Its primary functions include:
- Transporting coolant throughout the cooling system.
- Maintaining consistent engine operating temperatures.
- Preventing engine overheating.
- Supporting efficient radiator performance.
- Maintaining cooling system pressure.
- Helping maximise engine reliability and performance.
A correctly functioning coolant hose is essential for keeping the high-performance Mezger engine operating within its designed temperature range.
Why Do Coolant Hoses Fail?
Coolant hoses are exposed to constant heat, pressure and vibration, causing them to deteriorate over time.
Common causes of failure include:
- Age-related rubber hardening.
- Internal degradation from coolant chemicals.
- Heat cycling.
- Swelling or softening of the hose material.
- Cracking caused by age.
- Abrasion against surrounding components.
- Failure of hose connections or clamps.
Replacing ageing coolant hoses as part of preventative maintenance helps avoid unexpected breakdowns and costly engine repairs.
Symptoms of a Failing Coolant Hose
Typical warning signs include:
- Coolant leaks beneath the vehicle.
- Low coolant level warnings.
- Cracks or splits in the hose.
- Bulging or soft sections.
- White or pink coolant residue around hose connections.
- Sweet smell of coolant.
- Rising engine temperatures.
- Steam from the engine bay.
If any of these symptoms are present, the hose should be replaced immediately.
When Should the Water Coolant Hose Be Replaced?
Replacement is recommended when:
- Coolant leakage is detected.
- The hose becomes cracked or swollen.
- During major cooling system servicing.
- Replacing the water pump or thermostat.
- Carrying out an engine rebuild.
- As preventative maintenance on higher mileage vehicles.
Replacing worn hoses helps maintain cooling system integrity and protects the engine from overheating.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99710635790
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 Cayman 2.7L 987C 2006-08
- Porsche Cayman S 3.4L 987C 2005-08
Fits:
Porsche 987 Boxster / Boxster S 2005-08 (I480 / I481)
Porsche 987c Cayman / Cayman S 2006-08 (I480)
Porsche 986 All manual 1997-2004 (I480) / (I481)
* I480 - 6-speed manual transmission
* I481 - 5th-speed manual transmission
This product supersedes Porsche's old part numbers:
- 996 106 222 15
Click "Zoom in" to see the diagram.
Diagram ref no 10.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99610622217
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
Fits:
Porsche 986 Boxster / Boxster S 1997-04
This product supersedes Porsche's old part numbers:
- 99610655701
- 99610655702
Click "Zoom in" to see the diagram.
Diagram ref no 16.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99610655703
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
Fits:
Porsche 986 Boxster 1997-04
Click 'Zoom in' for large parts diagram.
Diagram ref no 3
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99610650206
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
Fits:
Porsche 986 Boxster 1997-04
Click 'Zoom in' for large parts diagram.
Diagram ref no 3
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99610650206
The product you are viewing cross references to these numbers