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- Porsche 991.2 Speedster 4.0L (510Bhp) 2019
- Porsche 991.2 GT3 4.0L (500 Bhp) / GT3 RS 4.0L (520 Bhp) 2017-19
Centre Radiator Coolant Hoses
These coolant hoses are designed for the centre radiator on
the Porsche 991.2 GT3, GT3 RS and 991 Speedster. They form part of the
high-performance cooling system used in Porsche’s naturally aspirated GT
engines, ensuring coolant flows efficiently between the engine and the centre
radiator.
Fits:
- Porsche 991.2 Speedster 4.0L (510Bhp) 2019
- Porsche 991.2 GT3 4.0L (500 Bhp) / GT3 RS 4.0L (520 Bhp) 2017-19
Diagram Ref No 6 and 7
High-revving GT models generate substantial heat, particularly during spirited driving and track use. Proper coolant circulation through the centre radiator helps maintain stable engine temperatures and supports consistent performance under demanding conditions.
What These Coolant Hoses Do
The Porsche 991.2 GT3 cooling system uses multiple radiators mounted at the front of the vehicle to manage engine temperatures. The centre radiator increases the system’s cooling capacity and helps remove excess heat from the coolant.
The hoses perform several important functions:
• Carry coolant to and from the centre radiator
• Maintain proper coolant circulation through the cooling system
• Help regulate engine temperature during high performance driving
• Support efficient heat transfer through the radiator core
Without properly functioning hoses, coolant flow may be restricted, reducing the effectiveness of the cooling system.
Why Coolant Hoses Fail
Cooling hoses operate under extreme conditions and are exposed to heat, pressure and vibration throughout their service life.
Common causes of failure include:
Heat ageing
Continuous temperature cycles can cause rubber hoses to harden, crack or lose
flexibility.
Pressure fatigue
Cooling systems operate under pressure, which can weaken hoses over time.
Chemical degradation
Coolant additives and contaminants can gradually break down rubber compounds.
Mechanical wear
Engine movement and vibration may cause stress or abrasion on hose connections.
Symptoms of Failing Coolant Hoses
• Coolant leaks near the front of the vehicle
• Low coolant level warning messages
• Sweet coolant smell around the front bumper area
• Visible cracking or swelling of the hose
• Engine temperature fluctuations during driving
Replacing worn hoses helps maintain proper coolant flow and prevents sudden coolant loss.
Why You May Need to Replace These Hoses
Maintain Cooling System Efficiency
Healthy hoses ensure coolant can circulate freely through the centre radiator
and engine.
Prevent Coolant Leaks
Replacing ageing hoses helps maintain the cooling system’s pressure and
prevents leaks.
Protect the High-Performance GT Engine
The GT3 and GT3 RS engines operate at high temperatures and require a fully
functional cooling system.
Avoid Costly Engine Damage
Loss of coolant can lead to overheating and significant mechanical damage if
not addressed quickly.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99110664
The product you are viewing cross references to these numbers
- Porsche Boxster 981 2.7L 2012-16
- Porsche Boxster 981 S / GTS 3.4L 2012-16
- 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 Cayman 2.7L 981 2013-16
- Porsche Cayman S / GTS 3.4L 981 2013-16
- Porsche Cayman GT4 3.8L 2015-16
Fits:
Porsche 991.1 Carrera 2012-16
Porsche 981 Boxster 2012-16 incl. Boxster Spyder
Porsche 981C Cayman 2012-16 incl. Cayman GT4
Click 'Zoom in' for large parts diagram.
Diagram ref no 30
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99110676
The product you are viewing cross references to these numbers
- Porsche Boxster 981 2.7L 2012-16
- Porsche Boxster 981 S / GTS 3.4L 2012-16
- Porsche Boxster 981 Spyder 3.8L 2016
- 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 Cayman 2.7L 981 2013-16
- Porsche Cayman S / GTS 3.4L 981 2013-16
- Porsche Cayman GT4 3.8L 2015-16
Fits:
Porsche 991.1 Carrera 2012-16
Porsche 981 Boxster 2012-16
Porsche 981SP Boxster Spyder 2016
Porsche 981C Cayman 2014-16
Porsche 981 Cayman GT4 2016
Click 'Zoom in' for large parts diagram.
Diagram ref no 9
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99110662
The product you are viewing cross references to these numbers
- Porsche Boxster 981 2.7L 2012-16
- Porsche Boxster 981 S / GTS 3.4L 2012-16
- 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 Cayman 2.7L 981 2013-16
- Porsche Cayman S / GTS 3.4L 981 2013-16
Fits:
For cars with centre radiator (option code: 153)
Porsche 991.1 Carrera 2012-16
Porsche 981 Boxster 2012-16
Porsche 981C Cayman 2014-16
Click 'Zoom in' for large parts diagram.
Diagram ref no 6
Related reference numbers
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99110663802
The product you are viewing cross references to these numbers