Initial Inspection and Diagnostic Overview

Transmission Cooling

Inspection and Verification

CAUTION: When internal wear/damage occurs in the transmission, metal particles, clutch plate material and band material can travel into the torque converter, the fluid cooler tubes, the in-tank transmission fluid cooler and the oil-to-air (OTA) transmission fluid cooler, if so 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.

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 fluid is found leaking from the in-tank transmission fluid cooler. Refer to Cooling System.
^ Install a new O-ring seal when transmission fluid is found leaking between the radiator transmission oil cooler and the transmission oil cooler fitting (not the cooler line into the fitting).
^ Install a new OTA transmission fluid cooler if there is leakage from the fluid cooler, and always as part of a transmission overhaul or exchange.
2. If the fault is not visually evident, GO to Symptom Chart. Symptom Related Diagnostic Procedures