4R100 Automatic Transmission Service and Repair Page 2381
1. Check the fluid level.
2. Observe the color and the odor. The color under normal circumstances should be dark reddish, not brown or black or have a burnt odor.
3. Hold the fluid level indicator over a white facial tissue and allow the fluid to drip onto the facial tissue and examine the stain.
4. If evidence of solid material is found, the transmission fluid pan should be removed for further inspection.
5. If the stain is a foamy pink color, this may indicate coolant in the transmission. The engine cooling system should also be inspected at this time.
6. If fluid contamination or transmission failure is confirmed by the sediment in the bottom of the fluid pan, the transmission must be disassembled
and completely cleaned. This includes the torque converter, coolers, and cooler lines.
7. Carry out diagnostic checks and adjustments; refer to Diagnosis By Symptom. See: Powertrain Management/Transmission Control
Systems/Testing and Inspection/Symptom Related Diagnostic Procedures/4R70W
Transmission Fluid Drain and Refill
Transmission Fluid Drain and Refill
Special Tool(s)
Draining
CAUTION: Always refer to the instructions supplied with the flush and fill machine.
NOTE: Draining fluid from the transmission by removing only the fluid pan is acceptable for vehicles that do not have a torque converter drain plug,
for normal or severe duty fluid maintenance.
NOTE: A new procedure for draining and adding transmission fluid using a suitable transmission flush and fill machine has been added. The
following procedure has different methods for draining and refilling the listed vehicles:
^
All vehicles using a suitable flush and fill machine.
^
Vehicles equipped with a torque converter drain plug.
^
Vehicles without a torque converter drain plug.
Use the method that is applicable to your vehicle.
All vehicles using a suitable flush and fill machine
1. With the vehicle in NEUTRAL, position on a hoist.
2. Use a suitable flush and fill machine to change the fluid.
3. When connecting the flush and fill machine, connect the machine to the fluid cooler tube after the fluid cooler on the cooler return line. This will
help remove any foreign material trapped in the fluid coolers.
Refill
4. Use only clean automatic transmission fluid.
5. Once the fluid exchange has been completed, disconnect the flush and fill machine.
Reconnect any disconnected fluid cooler tubes.
6. With the engine running and the transmission at normal operating temperature 66 - 77°C (150 - 170°F), check and adjust the transmission fluid
level, and check for any leaks. If fluid is needed, add fluid in increments of 0.24-liter (0.5-pint) until the correct level is achieved (fluid should be
in the cross-hatched area of the fluid level indicator).
Draining
Vehicles equipped with a torque converter drain plug
1. With the vehicle in NEUTRAL, position on a hoist.
