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- 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 Turbo 2010-13
- Porsche 997 MKII GT2 RS 2011-13
The Porsche Coolant Supply Hose 9A110666001 is a genuine Porsche replacement water hose used within the engine cooling system on selected Porsche 997-generation 911 models.
Fits:
- 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 Turbo 2010-13
- Porsche 997 MKII GT2 RS 2011-13
Diagram Ref No 15
The hose forms part of the engine-side coolant pipework and carries pressurised coolant through the water-pipe assembly, helping maintain stable engine temperature under normal driving and high-load operating conditions.
What This Product Does:
The engine cooling system circulates coolant through the engine, radiators, thermostat and associated pipes to remove excess heat.
The coolant supply hose forms part of this sealed, pressurised circuit.
Its functions include:
- Carrying engine coolant through the cooling system
- Maintaining consistent coolant circulation
- Supporting stable engine operating temperature
- Connecting associated water-pipe and engine cooling components
- Containing coolant under pressure
- Helping prevent coolant loss
- Supporting correct thermostat and water-pump operation
- Maintaining the factory Porsche cooling-system layout
Although relatively small, a sound supply hose is essential for keeping the cooling circuit sealed and dependable.
Symptoms Of Wear Or Failure:
Coolant hoses deteriorate over time through heat, pressure, vibration and chemical exposure.
Possible signs of failure include:
- Visible coolant leakage
- Pink, white or coloured coolant residue around the hose
- Dampness around hose connections
- Cracks in the hose surface
- Splitting around the ends
- Swollen or bulging hose sections
- Hose becoming unusually soft
- Hose becoming hard or brittle
- Coolant smell around the engine
- Falling coolant level
- Frequent need to top up coolant
- Low-coolant warning
- Engine-temperature fluctuations
- Engine overheating
- Steam from the engine area
A hose may also deteriorate internally without severe external cracking, so condition should be assessed carefully during cooling-system maintenance.
Why Replacement Matters:
A deteriorated coolant hose can eventually leak or rupture.
Because the cooling system operates under pressure, even a small split can lead to rapid coolant loss once the engine reaches operating temperature.
Continued driving with a failed hose may result in:
- Loss of cooling-system pressure
- Reduced coolant circulation
- Engine overheating
- Turbocharger heat-management problems
- Damage to seals and gaskets
- Cylinder-head damage
- Severe engine damage in extreme cases
- Vehicle breakdown
Replacing an aged or leaking hose restores the integrity of the cooling circuit and reduces the risk of sudden coolant loss.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
9A110666001
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