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Automatic Transmission Oil Cooler Flushing and Flow Test: Preparation

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. After the repair or replacement transmission is installed in the vehicle, do not connect the oil cooler pipes again.
    2. Fig 1: Identifying Flusher Tank & Components
    GM652486Courtesy of GENERAL MOTORS CORP.
    IMPORTANT:
    • Do not substitute with solutions that contain alcohol or glycol. Use of solutions that contain alcohol or glycol may damage the J 35944-A  , oil cooler components or transmission components.
    • The J 35944-22  flushing fluid is environmentally safe, yet powerful enough to cut through transmission fluid to dislodge any contaminants from the cooler. The safety precautions on the label regarding potential skin and eye irritations associated with prolonged exposure, are typical precautions that apply to many similar cleaning solutions. It should be noted that according to GM, use of other non-approved fluids for cooler flushing can have an adverse reaction to the seals inside the transmission.
  2. Remove the fill cap (9) on the J 35944-A  and fill the flusher tank (4) with 0.6 L (20-21 oz) of J 35944-22  flushing solution using the measuring cup (6). Do not overfill.
  3. Install the fill cap (9) on the J 35944-A  and pressurize the flusher tank (4) to 550-700 kPa (80-100 psi), using the shop air supply at the tank air valve (9).
    4. Fig 2: Flushing Transmission Oil Cooler Using J 35944
    GM652490Courtesy of GENERAL MOTORS CORP.
  4. Connect the J-44835-1  adapters to the transmission oil cooler lines.
  5. Connect the J 35944-A  discharge hose (5) to the oil cooler return pipe, top connector.
  6. Clip the discharge hose (5) onto the oil drain container.
  7. Attach the J 35944-A  to the undercarriage of the vehicle with the hook provided and connect the flushing system feed supply hose (3) from the J 35944-A  to the oil cooler feed pipe, bottom connector.
  8. With the water supply valve (1) on the J 35944-A  in the OFF position, connect the water supply hose from the J 35944-A  to the water supply at the faucet.
  9. Turn ON the water supply at the faucet.
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