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Porsche // 996 (911) (1997-2005) // 996 TURBO 2000-05
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Right Hand Coolant Hose for Centre Radiator
The right hand coolant hose is an essential cooling system component used on the Porsche 718
Boxster and 718 Cayman. This hose connects to the centre radiator and allows
coolant to circulate between the radiator and the engine cooling system.
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Diagram Ref No 7
Modern Porsche engines rely on efficient coolant circulation to maintain safe operating temperatures, especially during spirited driving or extended high-load conditions. A properly functioning coolant hose ensures consistent coolant flow and helps protect the engine from overheating.
What This Coolant Hose Does
The cooling system on the Porsche 718 uses multiple radiators positioned at the front of the vehicle to dissipate heat from the engine coolant. The centre radiator improves cooling efficiency under higher loads.
The left hand coolant hose helps:
• Carry coolant between the
centre radiator and the main cooling circuit
• Maintain stable engine operating temperatures
• Ensure efficient heat dissipation through the radiator system
• Support reliable cooling during fast road or track driving
Without proper coolant flow, engine temperatures can rise quickly, increasing the risk of overheating and engine damage.
Why Coolant Hoses Fail
Coolant hoses operate under constant pressure and high temperature conditions. Over time, materials degrade and may begin to fail.
Common causes of hose failure include:
Heat ageing
Continuous heating and cooling cycles can cause rubber hoses to harden or
crack.
Pressure fatigue
The cooling system operates under pressure, which can weaken older hoses and
cause swelling or splits.
Coolant contamination
Old coolant or contaminants may degrade hose materials internally.
Mechanical wear
Movement, vibration or contact with nearby components can damage the hose over
time.
Symptoms of a Failing Coolant Hose
• Visible coolant leaks under
the vehicle
• Sweet coolant smell from the front of the car
• Low coolant warning messages
• Engine temperature rising unexpectedly
• Visible cracking, swelling or soft spots on the hose
Replacing worn hoses prevents sudden coolant loss and protects the engine from overheating.
Why You May Need to Replace This Hose
Prevent Cooling System Leaks
Replacing ageing hoses ensures the cooling system remains properly sealed and
pressurised.
Maintain Engine Cooling
Performance
Reliable coolant flow is essential for maintaining correct operating
temperatures in high performance engines.
Protect Engine Components
Coolant loss can lead to overheating, which may cause severe engine damage if
left unresolved.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
9P1121630A
The product you are viewing cross references to these numbers
- Porsche 996 C4S 3.6L 09/01-2005
- Porsche 996 TURBO 2000-05
Genuine Porsche Upper radiator coolant hose - part of the core engine cooling system that moves radiator coolant effectively between components.
Sold each, Fits left or right side.
Fits:
Porsche 996 C4S 2002 - 2005
Porsche 996 Turbo 2001 - 2005
This product supersedes Porsche's old part numbers: 99610662174, 99610662178
Diagram Ref No 11.
The radiator coolant hose plays a vital role in the engine cooling system by transporting hot coolant from the engine to the radiator and returning cooled coolant back to the engine. This circulation helps regulate operating temperature, ensuring the engine stays within its optimal thermal range and preventing overheating during normal driving conditions.
Installed as part of the upper radiator hose system, the 99610662179:
• Transfers coolant between the radiator and engine cooling passages
• Helps maintain proper engine temperature control
• Supports consistent engine performance and longevity
• Uses durable rubber and reinforcement to withstand high heat, pressure, and vibration.
Replace this hose if you notice:
• Coolant leaks or wetness around the hose ends
• Cracks, bulges, or soft spots in the hose material
• Overheating or fluctuating engine temperatures
• During a cooling system overhaul or replacement of related hardware
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99610662179
The product you are viewing cross references to these numbers
- Porsche 996 C4S 3.6L 09/01-2005
- Porsche 996 TURBO 2000-05
Fits:
Porsche 996 C4S 2002>>
Porsche 996 Turbo
This product supersedes Porsche's old part numbers:
- 99610662574
- 99610662578
Diagram Ref No 12.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99610662579
The product you are viewing cross references to these numbers
- Porsche 996 C4S 3.6L 09/01-2005
- Porsche 996 TURBO 2000-05
Fits:
Porsche 996 C4S 2002>>
Porsche 996 turbo
This product supersedes Porsche's old part numbers:
- 99610662674 99610662677
Diagram Ref No 9.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99610662678
The product you are viewing cross references to these numbers
- Porsche 996 TURBO 2000-05
Fits:
Porsche 996 Turbo 2001-05
This product supersedes Porsche's old part numbers:
- 99610663973
- 99610663975
Click 'Zoom in' for large parts diagram.
Diagram Ref No 11
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99610663976
The product you are viewing cross references to these numbers