Initial Inspection and Diagnostic Overview

Transmission Cooling

Inspection and Verification

WARNING: If equipped with fire suppression system, refer to Fire Suppression System for Important Safety Warnings. Failure to follow this instruction may result in serious personal injury. Description and Operation

NOTICE: The transmission fluid cooler is not repairable with existing equipment due to the thermostatic bypass valve. Do not attempt to backflush and clean the transmission fluid cooler. Install a new transmission fluid cooler if there is leakage from the transmission fluid cooler, major metallic failure, multiple clutch or clutch plate failure, or sufficient component wear that results in metallic contamination. Refer to Transmission Fluid Cooler Transmission Fluid Cooler.

NOTICE: When internal wear/damage occurs in the transmission, metal particles, clutch plate material and band material can travel into the torque converter, the transmission fluid cooler tubes and the transmission fluid cooler. 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 Automatic Transaxle/Transmission - 4R70E/4R75E Transmission Fluid Cooler Tubes Backflushing and Cleaning and Torque Converter Contamination Inspection. Transmission Fluid Cooler Tubes Backflushing and Cleaning

1. Visually inspect for obvious signs of mechanical damage, incorrect component installation and system leaks. Repair as necessary.

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