Expedition 4WD V8-5.4L SOHC VIN 5 (2005)
Transmission Cooler: Testing and Inspection
Automatic Transmission - 4R70E/4R75E
Initial Inspection
Transmission Cooling
Inspection and Verification
CAUTION: When internal wear/damage occurs in the transmission, metal particles, clutch plate material and band material can travel into the torque
converter, the fluid cooler tubes, the in-tank transmission fluid cooler and the auxiliary transmission fluid cooler, if so equipped. These contaminants
are a major cause of recurring transmission concerns. To prevent future concerns, remove these contaminants from the cooling system before placing
the transmission back into use. Refer to fluid cooler flow testing, backflushing and cleaning, torque converter cleaning and inspection and flushing.
1. Visually inspect for obvious signs of mechanical damage, incorrect component installation and system leaks. Repair as necessary.
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Install a new or remanufactured radiator when fluid is found leaking from the intake transmission fluid cooler.
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Install a new auxiliary transmission fluid cooler if there is leakage from the fluid cooler.
2. If the fault is not visually evident, GO to Symptom Chart. See: Diagnosis By Symptom
Component Test
Transmission Fluid Cooler Leaks at Radiator
Transmission fluid may leak between the radiator transmission fluid cooler and the transmission fluid cooler fitting (not the cooler line into the fitting),
which may result in a residue of transmission fluid on the radiator tank around the fluid cooler fitting. Insufficient thread sealer on the transmission
fluid cooler fitting may cause this.
1. Clean the area around the transmission fluid cooler fittings.
2. Verify that transmission fluid is leaking between the transmission fluid cooler and the transmission fluid cooler fitting (not the transmission fluid
cooler line fitting into the transmission fluid cooler fitting).
3. Remove the radiator from the vehicle and place it on a flat surface with the transmission fluid cooler fittings facing upward.
