O-ring for tiptronic gearbox oil cooler o-ring Porsche 996/997  ❭  99970738640

Gearbox oil cooler o-ring,12.37 x 2.62
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

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