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 3.5L EcoBoost . | |
| Powertrain control system electrical inputs/outputs, vehicle wiring harnesses, PCM, TCC solenoid | CARRY OUT OBD test. REFER to the Engine Controls - Powertrain DTC Charts & Descriptions (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 3.5L EcoBoost . | |