GM Service Manual Online
For 1990-2009 cars only

Procedure Description

Tools Required

J 35944-A Oil Cooler and Line Flusher

  1. Remove the fill cap J 35944-A .
  2. Fill the J 35944-A with 0.6 liter (20 oz) of flushing solution.
  3. Do not overfill the J 35944-A .
  4. Follow the manufacturer's procedures for solution handling.
  5. Replace the cap on J 35944-A .
  6. Pressurize the J 35944-A to 550-700 kPa (80-100 psi).
  7. Connect the discharge hose on the transmission end of the oil cooler pipe that feeds the oiler cooler bottom fitting.
  8. Clip the discharge hose to the oil drain container.
  9. Connect the feed hose from J 35944-A to the remaining oil cooler pipe.
  10. Place the water valve on J 35944-A with the water turned off.
  11. Connect the water supply to J 35944-A with the water valve.
  12. Turn on the water valve for about 10 seconds.
  13. Flush the transmission fluid.
  14. Replace the cooler or the pipes if the water does not flow through the cooler. Refer to Transmission Fluid Auxiliary Cooler Replacement or Automatic Transmission Oil Cooler Pipes Replacement and Automatic Transmission Oil Cooler Pipes Replacement .
  15. Close the water valve.
  16. Clip the discharge hose to the 5-gallon pail.
  17. Cover the pail with a shop towel in order to prevent splashing.
  18. Turn on the water valve.
  19. Depress the trigger in order to mix the flushing solution into the water flow.
  20. Hold the trigger down using the bale clip.
  21. Flush the cooler with water and a solution for 2 minutes.
  22. Attach the air supply to the air valve on the tool for 3-5 seconds every 15-20 seconds during the flush.
  23. Release the trigger.
  24. Turn the water valve off.
  25. Disconnect the hoses from the oil cooler pipes.
  26. Connect the hoses to the pipes opposite the initial flush.
  27. Perform a backflush.
  28. Turn on the water valve.
  29. Depress the trigger in order to mix the flushing solution into the water flow.
  30. Hold the trigger down using the bale clip.
  31. Flush the cooler with water and a solution for 2 minutes.
  32. Attach the air supply to the air valve on the tool for 3-5 seconds every 15-20 seconds during the flush.
  33. Release the trigger.
  34. Allow the water to rinse for 1 minute.
  35. Turn the water valve off.
  36. Attach the air supply on the air valve.
  37. Dry the system out with the air until no moisture leaves the discharge hose.
  38. Connect the cooler feed pipe on the transmission.
  39. Connect the discharge hose on the cooler return pipe.
  40. Clip the hose on the oil drain container.
  41. Start the engine after filling the transmission with the fluid.
  42. Allow the engine to run for 30 seconds.
  43. Inspect that approximately 2 quarts of fluid flows during a 30 second period.
  44. Inspect the transmission fluid flow if the flow is insufficient by doing the following:
  45. 44.1. Disconnect the feed line at the cooler.
    44.2. Observe the flow with the engine running.
    44.3. Inspect the transmission.
  46. If the flow from the transmission is sufficient, do the following:
  47. 45.1. Inspect the cooler pipes.
    45.2. Inspect the fittings.
    45.3. Repeat the cooler flushing procedure.
    45.4. Replace the cooler if the cooler flow is still insufficient. Refer to Transmission Fluid Auxiliary Cooler Replacement in Engine Mechanical.
  48. Remove the discharge hose.
  49. Connect the cooler pipe.
  50. Adjust the fluid level.