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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1053 (Automatic Transmission - ALLISON (Troubleshooting)) >> Troubleshooting >> Automatic Transmission Oil Cooler Flushing and Flow Test >> Back Flush

Back Flush

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Disconnect both hoses from the oil cooler pipes and then connect them to the opposite oil cooler pipe. This will allow the oil cooler and pipes to be back flushed.
  2. Repeat steps 3 and 4 of the INITIAL FLUSH procedure.
  3. Release the trigger (8) of the J 35944-A  and allow water only to rinse the oil cooler and pipes for 1 minute.
  4. Turn the J 35944-A  water supply valve (1) to the OFF position and turn OFF the water supply at the faucet.
  5. Attach the shop air supply to the flushing system feed air valve (2) on the J 35944-A  and blow out the water from the oil cooler and pipes. Continue until no water comes out of the discharge hose (5).
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