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HOMESERVICE MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 219 (AUTOMATIC TRANSMISSION SERVICING)LUBRICATIONOIL COOLER FLUSHING & FLOW CHECKCLEAN-UP
1999 GMC Forward Control 5.7 R, Automatic

Oil Cooler Flushing & Flow Check: Clean-Up

1999 GMC Forward Control 5.7 R, AutomaticSECTION Clean-Up
WARNING: This page is about a different car, the 2003 GMC Sonoma, 2003 GMC Jimmy, 2003 Chevrolet S10 Pickup, and 2003 Chevrolet Blazer. However, it is still accessible from the selected car via links, so may be relevant.
  1. Disconnect the water supply hose from the transmission oil cooler and line flusher and bleed any remaining air pressure from the flusher tank.
  2. Remove the fill cap from the transmission oil cooler and line flusher and return any unused flushing solution to its container. Rinse the transmission oil cooler and line flusher with water. DO NOT store the transmission oil cooler and line flusher with flushing solution in it.
  3. After every third use, clean the transmission oil cooler and line flusher as described in the instructions included with the tool.
  4. Dispose of any waste water/solution and transmission fluid in accordance with local regulations.
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Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.