Flow Check
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.
- Disconnect both hoses from the oil cooler pipes. Connect the oil cooler feed pipe, bottom connector, to the transmission. Connect the return pipe, top connector, to the discharge hose (5). This will require the use of J-44835-1 . Clip the discharge hose (5) onto an empty oil drain container.
- Confirm the transmission is filled with automatic transmission fluid.
- Start the engine with the transmission in PARK range and run for 5 seconds at 2,400 RPM. A minimum of 2.2 L (2.3 quarts) must be discharged during this 5 second run time.
- If fluid flow is greater than 2.2 L (2.3 quarts) in 5 seconds at 2,400 RPM, go to step 4.
- If fluid flow is less than 2.2 L (2.3 quarts) in 5 seconds at 2,400 RPM, perform the following diagnosis:
Disconnect the oil cooler feed line at the radiator. Connect the discharge hose (5) to the cooler feed line. Clip the discharge hose (5) to the empty oil drain container. Start the engine with the transmission in PARK range and run for 5 seconds at 2,400 RPM. A minimum of 2.2 L (2.3 quarts) must be discharged during this 5 second run time at 2,400 RPM. Do the following according to the flow rate:
- Insufficient feed flow: Inspect the transmission.
- Sufficient feed flow: Inspect the oil cooler return pipe, the oil cooler located in the radiator, and the auxiliary oil cooler.
- Remove the discharge hose (5), connect the cooler feed and return pipes to the transmission and fill the unit to the proper fluid level. Inspect the transmission oil cooler pipe connections at the radiator, the auxiliary cooler and the transmission for leaks.