Initial Inspection and Diagnostic Overview

Transmission Cooling

Inspection and Verification

NOTICE: When internal wear or damage occurs in the transmission, metal particles and clutch plate material can travel into the torque converter, the transmission fluid cooler tubes, the in-tank transmission fluid cooler and the auxiliary transmission fluid cooler, if equipped. These contaminants are a major cause of recurring transmission concerns. To prevent future concerns, remove these contaminants from the cooling system before placing the transmission back into use. Refer to Transmission Fluid Cooler Backflushing and Cleaning in Automatic Transaxle/Transmission - 6R80 Transmission Fluid Cooler Backflushing and Cleaning.

1. Visually inspect for obvious signs of mechanical damage, incorrect component installation and system leaks. Repair as necessary.
- Install a new or remanufactured radiator when transmission fluid is found leaking from the in-tank transmission fluid cooler. Refer to Engine Cooling Radiator.

- Install a new O-ring when transmission fluid is found leaking between the radiator transmission fluid cooler and the transmission fluid cooler fitting (not the cooler tube into the fitting). Refer to the Component Test. Transmission Cooling

- Install a new auxiliary transmission fluid cooler if there is leakage from the transmission fluid cooler. Refer to Auxiliary Transmission Fluid Cooler Auxiliary Transmission Fluid Cooler.

2. If the fault is not visually evident, GO to Symptom Chart - Transmission Cooling or GO to Symptom Chart - NVH. Symptom Chart - Transmission Cooling Symptom Chart - NVH