Symptom Chart - Transmission Cooling

Symptom	Possible Sources	Action
Transmission overheating	Clogged transmission fluid cooler or transmission fluid cooler tubes or hoses Bent or crushed transmission fluid cooler tubes or hoses	INSPECT the transmission fluid cooler and the transmission fluid cooler tubes for damage or plugging. INSTALL new components as necessary.
Transmission cooling system restricted		CARRY OUT the Transmission Fluid Cooler Backflushing and Cleaning. REFER to: Transmission Fluid Cooler - Backflushing and Cleaning .
Excessive vehicle or towing loads, severe vehicle use		REFER to the Vehicle Specification Manual for load and GVW information. REFER to the Owner's Literature.
Incorrect transmission fluid level		CHECK and if necessary ADJUST the transmission fluid to the correct level. REFER to: TRANSMISSION FLUID LEVEL CHECK .
System leaks		INSPECT transmission fluid cooler and transmission fluid cooler lines and hoses for leaks. SERVICE as required.
Transmission fluid condition		CHECK transmission fluid condition.
Incorrect transmission fluid type		REFER to:SPECIFICATIONS .
Engine overheating		REFER to: Engine Cooling .
Powertrain control system electrical inputs/outputs, vehicle wiring harnesses, PCM, TCC solenoid		CARRY OUT OBD test. REFER to ENGINE CONTROLS - INTRODUCTION (EXCEPT DIESEL & HYBRID) .
Internal transmission concerns		REPAIR as necessary.
Transmission fluid heater coolant control valve malfunctioning		INSTALL a new transmission fluid heater engine coolant bypass valve. REFER to: Transmission Fluid Heater Coolant Control Valve .