Symptom Chart -- Transmission Cooling

Diagnostics in this article assume a certain skill level and knowledge of Ford-specific diagnostic practices. REFER to: Diagnostic Methods .

Symptom	Possible Sources	Action
Transmission overheating	Clogged transmission fluid cooler or transmission fluid cooler tubes Bent or crushed transmission fluid cooler tubes Transmission fluid cooler thermal bypass valve stuck closed	INSPECT the transmission fluid cooler, transmission fluid cooler tubes and transmission fluid thermal bypass valve for damage or plugging. INSTALL new components as necessary.
System leaks		INSPECT transmission fluid cooler, transmission fluid heat exchanger and the transmission fluid cooler tubes for leaks. SERVICE as required.
Transmission fluid level is too high		REFER to: Transmission Fluid Level Check .
Vibration -- a high frequency (20-80 Hz) that is felt through the seat or gear shifter. Changes with engine speed	Transmission fluid cooler tubes grounded	CHECK the transmission fluid cooler tubes. REPAIR as necessary.
Other Concerns	Assembly gel present in transmission cooler case ports and/or main control assembly on new or low mileage transmissions	A clear gel-like grease is injected into the transmission case cooler ports before the transmission is shipped from the assembly plant. If enough grease is injected, it may be pushed back into the main control. The grease acts as a plug to prevent leaks during transmission installation into the vehicle. Grease found in the cooler ports and/or main control in new transmission assemblies is normal and has no effect on performance. As the transmissions gets up to operating temperature, the grease will melt and dissolve into the transmission fluid.