Automatic Transaxle - 4T65-E - Service, Diagnosis & Troubleshooting: Maintenance Chevrolet Uplander I

Transmission Fluid Checking Procedure

Transmission Fluid Checking Procedure

Possible Points of Fluid Leaks

Transmission Oil Pan

1. Incorrectly tightened oil pan bolts
2. Improperly installed or damaged oil pan gasket
3. Damaged oil pan or mounting face
4. Incorrect oil pan gasket

Case Leak

1. Damaged or missing fill tube seal
2. Mislocated fill tube bracket
3. Damaged vehicle speed sensor seal
4. Damaged manual shaft seal
5. Loose or damaged oil cooler connector fittings
6. Worn or damaged propeller shaft oil seal
7. Loose line pressure pipe plug
8. Warped
9. Distorted torque converter housing
10. Porous casting

Leak at the Torque Converter End

1. Converter leak in the weld area
2. Converter seal lip cut. Check the converter hub for damage
3. Converter seal bushing moved forward and damaged
4. Converter seal garter spring missing from the seal
5. Porous casting of the transmission case or the oil pump

Leak at the Vent Pipe or the Fluid Fill Tube

1. Overfilled system
2. Water or coolant in the fluid-the fluid will appear milky.
3. Transmission case porous
4. Incorrect fluid level indicator
5. Plugged vent
6. Drain-back holes plugged
7. Mispositioned oil pump to case gasket, if equipped

Scheme 91

Back Flush

1. Inspect the transmission oil cooler pipes for kinks or damage. Repair as necessary.
2. Connect the J 35944-A to the oil cooler feed top connector. See «Special Tools»(ref-241713-S11115775082006081100000) .
3. Clip the discharge hose (2) onto the oil drain container.
4. Attach the J 35944-A to the undercarriage of the vehicle with the hook provided and connect the flushing system feed supply hose (1) from the J 35944-A to the bottom connector oil cooler return pipe. See «Special Tools»(ref-241713-S11115775082006081100000) .
5. Turn the J 35944-A water supply valve (3) to the ON position and allow water to flow through the oil cooler and pipes for 10 seconds to remove any remaining transmission fluid. See «Special Tools»(ref-241713-S11115775082006081100000) . If water does not flow through the oil cooler and pipes, the cause of the blockage must be diagnosed and the plugged component must be repaired or replaced. Continue with the cooler flushing and flow check procedure once the blockage is corrected.
6. Turn the J 35944-A water supply valve (3) to the OFF position and clip the discharge hose onto a 19 liter (5 gallon) pail with a lid, to avoid splashback. See «Special Tools»(ref-241713-S11115775082006081100000) .
7. Turn the J 35944-A water supply valve (3) to the ON position and depress the trigger (1) to mix cooler flushing solution into the water flow. See «Special Tools»(ref-241713-S11115775082006081100000) . Use the clip provided on the handle to hold the trigger (1) down. The discharge will foam vigorously when the solution is introduced into the water stream.
8. Flush the oil cooler and pipes with water and solution for 2 minutes. During this flush, attach the shop air supply 825 kPa (120 psi) to the flushing system feed air valve (2) located on the J 35944-A , for 3-5 seconds at the end of every 15-20 second interval to create a surging action. See «Special Tools»(ref-241713-S11115775082006081100000) .
9. Release the trigger (1) and turn the J 35944-A water supply valve (3) to the OFF position. See «Special Tools»(ref-241713-S11115775082006081100000) .

Forward Flush

1. Disconnect both hoses (1 and 2) from the oil cooler pipes and connect them to the opposite oil cooler pipe. This will allow the oil cooler and pipes to be flushed in the normal flow direction.
2. Repeat Step 6 and 7 of the Back Flush.
3. Release the trigger (1) of the J 35944-A and allow water only to rinse the oil cooler and pipes for 1 minute. See «Special Tools»(ref-241713-S11115775082006081100000) .
4. Turn the J 35944-A water supply valve (3) to the OFF position and turn OFF the water supply at the faucet. See «Special Tools»(ref-241713-S11115775082006081100000) .
5. Attach the shop air supply to the flushing system feed air valve (2) on the and J 35944-A blow out the water from the oil cooler and pipes. See «Special Tools»(ref-241713-S11115775082006081100000) . Continue, until no water comes out of the discharge hose.

Cooler Flow Check and Flushing Steps

1. Machine Set-up
2. Determine Minimum Flow Rate
3. Back Flush
4. Forward Flush
5. Flow Test
6. Code Recording Procedure
7. Clean-up

Tools Required

1. J 45096 Transmission Oil Cooling System Flush and Flow Test Tool. See «Special Tools»(ref-241713-S11115775082006081100000) .
2. Shop air supply with water/oil filters, regulator and pressure gage - minimum 90 psi
3. Eye protection
4. Rubber gloves

Back Flush Procedure

1. Connect the J 45096 adapters (1) to the vehicle's transmission oil cooler supply and return lines at the transmission. See «Special Tools»(ref-241713-S11115775082006081100000) .
2. Connect the black supply hose (1) to the return line, top connector of the transmission and the clear waste hose (2) to the feed line, bottom connector of the transmission, to the vehicle cooler lines. This is the reverse flow - backflush direction.
3. Turn the main function switch to the FLUSH position. Allow the machine to operate for 30 seconds.
4. Turn the main function switch to the IDLE position and allow the supply vessel pressure to dissipate.

1. Disconnect the supply and waste hoses from the vehicle cooler lines. Reverse the supply and waste hoses to provide a normal flow direction.
2. Turn the main function switch to the FLUSH position and allow machine to operate for 30 seconds.

Automatic Transmission Fluid Leaks

Automatic Transmission Fluid Leaks

Whine Noise Varying with RPM or Fluid Pressure

Whine Noise Varying with RPM or Fluid Pressure