Symptom Chart
Symptom Chart - Transmission Cooling
| Symptom | Possible Sources | Action |
|---|---|---|
| Transmission overheating | Bent or crushed transmission fluid cooler tubes | INSPECT the transmission fluid cooler tubes for damage. INSTALL new components as necessary. |
| Clogged transmission fluid cooler or transmission fluid cooler tubes | INSPECT the transmission fluid cooler and the transmission fluid cooler tubes for plugging. INSTALL new components as necessary. | |
| Cooler bypass valve stuck closed | INSTALL a new cooler bypass valve. TEST the system for normal operation. | |
| Transmission fluid warmer coolant control valve is sticking | INSTALL a known good coolant control valve. TEST the system for normal operation. | |
| System leaks | INSPECT the transmission fluid cooler, the transmission fluid cooler tubes and the cooler bypass valve for leaks. INSTALL new components as necessary | |
| Transmission fluid level overfull | REFER to: Transmission Fluid Level Check . | |
| Internal transmission concerns | REFER to: Diagnosis By Symptom . | |
| 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. |