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Pipes
This Genuine Porsche gearbox oil cooler O-ring is an OE sealing ring for selected Porsche 996 and 997 transmission oil cooler hose applications. It seals the automatic transmission cooler line connection, helping prevent ATF leaks and maintain reliable gearbox cooling system operation. Ideal for gearbox oil cooler service, transmission hose repair or replacing a leaking, hardened or damaged original O-ring.
Sold individually
Fits:
Porsche 996 C2 / C4 2002>> Tiptronic
Porsche 996 TURBO Tiptronic
Porsche 997 Gen 1 C2 / C4 2005>> Tiptronic
Porsche 997 Gen 1 TURBO Tiptronic
O-ring for Tiptronic gearbox oil cooler
2002 Onwards
Two O-rings required
Diagram ref no 3
This O-ring is used in the transmission oil cooler / hose connection on selected Porsche 996 and 997 models.
What This Part Does / Functions
• Seals the gearbox / transmission oil cooler hose connection
• Helps prevent automatic transmission fluid leaks
• Maintains correct sealing in the ATF cooler circuit
• Supports reliable transmission cooling system operation
• Helps prevent fluid seepage at the cooler hose fitting
• Provides correct OE Porsche size, profile and fitment
• Replaces a flattened, hardened, cut or leaking original O-ring
• Supports correct reassembly after gearbox oil cooler or hose service.
Why Replace This Part?
O-rings are exposed to heat, transmission fluid, pressure changes and age-related hardening. Over time, the seal can flatten, crack, swell or lose elasticity. A worn or damaged O-ring may allow ATF / gearbox oil to leak from the oil cooler hose connection. Replacing it with a Genuine Porsche OE gearbox oil cooler O-ring helps restore the correct seal and supports reliable transmission cooling operation.
Common Symptoms of a Failed Gearbox Oil Cooler O-Ring
• Transmission fluid leak near the gearbox oil cooler hose
• Fluid residue around the cooler line fitting. Low transmission fluid level
• Red or darkened ATF fluid under the vehicle
• Oil cooler hose seepage after previous repair work
• O-ring found hardened, flattened or cut during inspection
• Transmission cooling circuit leak after hose removal
• Need to reseal the cooler line during gearbox service.
When to Replace This Part
• When removing or refitting the gearbox oil cooler hose
• During automatic transmission oil cooler service
• If transmission fluid is leaking from the cooler hose connection
• If the O-ring is flattened, hardened, cracked or damaged
• During Tiptronic transmission service or repair
• When replacing the gearbox oil cooler or related cooler pipework
• After separating the cooler line connection.
Where It Fits on the Car
This O-ring fits at the automatic transmission / gearbox oil cooler hose connection. It seals the fitting between the oil cooler and cooler hose / line in the transmission cooling circuit. Correct installation is important. The sealing surface should be clean, and the O-ring should be fitted without twisting, pinching or damage.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99970738640
The product you are viewing cross references to these numbers
- Porsche 996 C2 3.6L 09/01-2005
- Porsche 996 C4 3.6L 09/01-2005
- Porsche 996 C4S 3.6L 09/01-2005
- Porsche 996 TURBO 2000-05
- Porsche 996 GT2 2001-05
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12 Month Warranty
Worldwide Delivery
For Cars With Tiptronic Gearbox ONLY!
Fits:
Porsche 996 Carrera 2002>>2005
Cars With Option Codes:
338 - Rear-Wheel Drive
339 - All-Wheel Drive
Porsche 996 Turbo / GT2 2001>>2005
Porsche 997.1 Carrera MKI 2005>>2008
Porsche 997.1 Turbo / GT2 MKI 2007>>2009
Diagram Ref No 6
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
0009971171
The product you are viewing cross references to these numbers
- 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
- Porsche 996 C4S 3.6L 09/01-2005
- Porsche 996 TURBO 2000-05
- Porsche 996 GT2 2001-05
- Porsche 997 MK1 Carrera 2 3.6L 2005-08
- Porsche 997 MK1 Carrera 2S 3.8L 2005-08
- Porsche 997 MK1 Carrera 4 3.6L 2005-08
- Porsche 997 MK1 Carrera 4S 3.8L 2005-08
- Porsche 997 MK1 TURBO 2007-09
- Porsche 997 MK1 GT2 2007-09
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12 Month Warranty
Worldwide Delivery
Porsche Transmission Coolant Pipes - Essential Gearbox Cooling Flow Components
Porsche transmission coolant pipes carry coolant between the gearbox, coolant control valves, and transmission oil coolers, ensuring consistent temperature regulation under all driving conditions. By maintaining correct coolant flow, these pipes protect transmission oil, seals, and internal components from overheating and premature wear.
Available from Design911, transmission coolant pipes are supplied to OEM specifications, making them suitable for maintenance, repairs, and complete cooling system refurbishments.
What Do Porsche Transmission Coolant Pipes Do?
Transmission coolant pipes form the physical flow network of the gearbox cooling system.
Core Functions:
- Transport coolant to and from the transmission oil cooler
- Maintain stable gearbox operating temperatures
- Support efficient transmission oil cooling
- Prevent thermal stress on internal gearbox components
- Enable correct operation of coolant control and change over valves
Healthy coolant pipes are essential for reliable transmission thermal management.
Why Do Transmission Coolant Pipes Fail?
Transmission coolant pipes are exposed to heat, pressure, vibration, and environmental conditions.
Common Causes of Failure:
- Corrosion in metal pipes from age or coolant degradation
- Cracking or hardening of plastic and rubber sections
- Heat cycling causing material fatigue
- Leaks at pipe joints or O-ring connections
- Physical damage from road debris or incorrect installation
Failure can result in coolant loss, overheating, and transmission damage.
When Should Transmission Coolant Pipes Be Replaced?
Porsche transmission coolant pipes should be inspected and replaced when signs of deterioration appear.
Replacement Indicators:
- Visible coolant leaks or staining
- Cracked, swollen, or brittle pipe sections
- Repeated low coolant warnings
- Overheating or inconsistent transmission temperatures
- During transmission or cooling system servicing
Preventative replacement helps avoid sudden coolant loss and expensive gearbox repairs.
Highlights
- Essential Porsche gearbox cooling system components
- Maintains reliable coolant flow and temperature control
- OEM-spec fitment and durability
- Suitable for road, fast-road, and performance applications
- Helps prevent overheating and premature gearbox wear
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Saturday: Closed
Sunday: Closed