Transmission Cooling Inspection and Verification Automatic
Transmission CAUTION: Do not attempt to backflush and clean the
oil-to-air (OTA) transmission fluid cooler. Install a new OTA
transmission fluid cooler as part of a transmission overhaul or
exchange. Failure to follow these directions may result in transmission
damage. NOTE: When internal wear or 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 OTA transmission fluid cooler. 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. 1. Clean the
contaminants from the transmission fluid cooling system. Carry out the
following: • transmission fluid cooler-backflushing and cleaning •
torque converter flushing • torque converter cleaning and inspection •
4R100 cooler bypass valve cleaning and inspection Also carry out the
transmission fluid cooler flow test. For additional information, refer
to Section 307-01A and Section 307-01B. 2. Visually inspect for
obvious signs of mechanical damage, incorrect component installation,
and system leaks. Repair as necessary.
• Install a new or remanufactured radiator when fluid is found leaking
from the in-tank transmission fluid cooler. For additional information,
refer to Section 303-03. • Install a new OTA transmission fluid cooler
if there is leakage from the fluid cooler, and always as part of a
transmission overhaul or exchange. For additional information, refer to
Auxiliary Transmission Fluid Cooler Oil-to-Air Fluid Cooler, 4R100,
Auxiliary Transmission Fluid Cooler Oil-to-Air Fluid Cooler,
TorqShift, F-Super Duty or Auxiliary Transmission Fluid Cooler Oil-to-Air Fluid Cooler, TorqShift, Excursion in this section. 3. If
the fault is not visually evident, GO to Symptom Chart – Automatic
Transmission.
2004 Ford Excursion, F-Super Duty 250-550, Transaxle / Transmission Cooling Diagnosis And Testing
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