OEM GMC C2500 Transmission Oil Cooler

GMC C2500 Transmission Oil Cooler Parts and Q&A

• Transmission Cooler
  89022535
  Q: How to service the Transmission Oil Cooler for the 4L80-E Automatic Transmission on GMC C2500?

  A:

  Begin servicing the Transmission Oil Cooler using 4l80-e automatic transmission by first removing the two bolts that fasten the auxiliary Oil Cooler bracket to the radiator support removed, and the auxiliary Oil Cooler removed from the radiator support. For install, replace the two bolts that hold the Oil Cooler to the support radiator with a tolerance of 12 nm (9 inches lbs.) and ensure that the guide pin bolt goes into the support hole.
• Transmission Cooler
  89022577
  Q: How to flush the Transmission Oil Cooler and lines after installing a repaired or replacement transmission on GMC C2500?

  A:

  Leave the oil cooler lines disconnected during installation of the repaired or replacement transmission. The j35944-a Transmission Oil Cooler and line flusher requires 0.6 l (20-21 oz.) of flushing solution which needs to be added before applying 550-700 kpa (80-100 psi) of shop air pressure. Use the discharge hose to connect with the oil cooler return line and attach it to an oil drain container. Install the j35944-a below the vehicle using the hook attachment then join the hose from the j35944-a to the second oil cooler line. Following water valve off positioning on j35944-a you should connect your water hose from the supply and enable water access through the faucet. The j35944-a allows water to flush through its oil cooler lines for ten seconds by setting the valve to on position to drain transmission fluid. Proceed with caution when flushing the cooler lines because blocked materials require diagnosis and repair before you continue. Use the j35944-a off water control to deactivate the water supply then fasten the drainage hose to a covered five-gallon pail. Apply on position to the water valve on j35944-a while pressing the trigger to mix flushing solution with water until vigorous foam appears. Keep the trigger down using the handle clip. The flushing operation combines water with solution for two minutes while connecting the short burst of compressed air to the j35944-a air valve at 3 to 5 second intervals throughout a 15 to 20 second period before releasing the trigger and turning off the water supply. You should disconnect both hoses from their current lines then transfer them to work with the opposite oil cooler line before repeating the flushing process. Zero in the water supply then use air pressure to drain the water from the oil cooler and lines until only clear air emerges from the discharge hose. During the flow check test you need to disconnect both hoses from the oil cooler lines then link the oil cooler feed line to the transmission and the return line to the discharge hose before clamping the discharge hose onto an empty oil drain container. Begin by filling your transmission with automatic transmission fluid and start the engine in park range until it runs for thirty seconds while expecting fluid discharge to reach 1.9 liters (2 quarts). Go to the following step when fluid flow reaches more than 1.9 l (2 quarts). To lower the fluid output below 1.9 l (2 quarts) disconnect the oil cooler feed line at the radiator before using it to connect to the empty oil drain container. Let your vehicle run for 30 seconds while it's in the park position where discharge must reach at least 1.9 l (2 quarts). An insufficient amount of feed flow requires transmission inspection. Check both the return line of the cooler and the cooler itself if inspection reveals sufficient condition. Finish by disconnecting the discharge tube then reestablishing connections between the transmission's feed and return lines and restocking the unit to the recommended fluid amount.