Symptom Chart

Diagnostics in this article assume a certain skill level and knowledge of Ford-specific diagnostic practices. Refer to Diagnostic Methods in SERVICE INFORMATION for more information.

SYMPTOM CHART

Condition	Possible Sources	Action
Transmission overheating	Clogged transmission fluid cooler or transmission fluid cooler tubes Bent or crushed transmission fluid cooler tubes Transmission fluid thermal bypass valve stuck closed Engine cooling system	INSPECT the transmission fluid cooler, transmission fluid cooler tubes and transmission fluid thermal bypass valve for damage or plugging. INSTALL new components as necessary. INSPECT the engine cooling system for damage and correct operation. Refer to ENGINE COOLING .
	Refer to diagnostic routines	INSPECT the temperature control valve - transmission fluid for damage. If physical damage is not found, inspect the electrical system. GO to PINPOINT TEST A .
	System leaks	INSPECT transmission fluid cooler and transmission fluid cooler tubes for leaks. SERVICE as required.
	Internal transmission concerns	REFER to AUTOMATIC TRANSMISSION - 6F50/6F55 .
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.