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Home >> Lincoln >> 2018 >> MKZ Select, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 23 (Transmission Cooling - 6-Speed Automatic Transmission - 6F50/6F55 (Except Hybrid)) >> Diagnosis And Testing >> Transmission Cooling >> Symptom Chart - Transmission Cooling

Symptom Chart - Transmission Cooling

WARNING: This page is about a different variant/trim than selected.

Diagnostics in this manual 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
Transmission auxiliary fluid cooler can get covered with mud.		 INSPECT the transmission fluid cooler, transmission fluid cooler tubes and transmission fluid thermal bypass valve for damage or plugging. INSTALL new components as necessary.
CLEAN the transmission auxiliary fluid cooler exterior. REFER to: Transmission Fluid Auxiliary Cooler Cleaning .
Transmission fluid warmer coolant control valve is sticking INSTALL a known good coolant control valve. TEST the system for normal operation.
System leaks INSPECT transmission fluid cooler and transmission fluid cooler tubes for leaks. SERVICE as required.
Internal transmission concerns REFER to: Automatic Transmission - 3.0L EcoBoost .
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. REFER to: Transmission Fluid Cooler Tubes .
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