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Porsche // 996 (911) (1997-2005) // Any
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Centre Radiator Coolant Hoses
These coolant hoses are designed for the centre radiator on
the Porsche 992 and 992 turbo models. They form part of the
high-performance cooling system used in Porsche’s engines, ensuring coolant flows efficiently between the engine and the centre
radiator.
Fits:
- Porsche 992.1 Carrera 2 3.0L 2019-24
- Porsche 992.1 Carrera 4 3.0L 2019-24
- Porsche 992.1 Carrera 2 Cabriolet 3.0L 2019-24
- Porsche 992.1 Carrera 4 Cabriolet 3.0L 2019-24
- Porsche 992.1 Carrera 2S / GTS 3.0L 2019-24
- Porsche 992.1 Carrera 4S / GTS 3.0L 2019-24
- Porsche 992.1 Carrera 2S / GTS Cabriolet 3.0L 2019-24
- Porsche 992.1 Carrera 4S / GTS Cabriolet 3.0L 2019-24
- Porsche 992.1 Targa 4 3.0L 2020-24
- Porsche 992.1 Targa 4S / GTS 3.0L 2020-24
- Porsche 992.1 Turbo 3.8L 2020-24
- Porsche 992.1 Turbo S 3.8L 2020-24
- Porsche 992.1 Turbo Cabriolet 3.8L 2020-24
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- Porsche 992.2 Carrera 2 GTS 3.6L 2024>>
- Porsche 992.2 Carrera 4 GTS 3.6L 2024>>
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- Porsche 992.2 Carrera 2 GTS 3.6L Cabriolet 2024>>
- Porsche 992.2 Carrera 4 GTS 3.6L Cabriolet 2024>>
- Porsche 992.2 Targa 4 GTS 3.6L 2024>>
- Porsche 992.2 Turbo 3.6L 2024>>
Diagram Ref No 2 and 3
High-revving 992 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 992 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 Engine
These 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.
9921216
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 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 996 C2 3.4L 1997-08/01
- Porsche 996 C4 3.4L 1997-08/01
- Porsche 996 C2 3.6L 09/01-2005
- Porsche 996 C4 3.6L 09/01-2005
Fits:
Porsche 996 C2 / C4 1998-05 TIPTRONIC
Porsche 986 Boxster 2.5L / 2.7L 1997-04 TIPTRONIC
Porsche 986 Boxster S 3.2L
This product supersedes Porsche's old part numbers:
- 99610666555
- 99610666557
Click picture for large parts diagram.
Diagram Ref No 8.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99610666558
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