Flow Test

WARNING: This page is about a different car, the 2003 Oldsmobile Bravada, 2003 GMC Envoy XL, 2003 GMC Envoy, and 2003 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Turning Main Function Switch To FLOW Position

Courtesy of GENERAL MOTORS CORP.

Important: If the flow rate is less than 0.5 gpm, the LCD displays an error message. Refer to the Troubleshooting section of the operation manual.

Turn the main function switch to the FLOW position and allow the oil to flow for 15 seconds. Observe and note the flow rate; this is the TESTED flow rate.
Compare the TESTED flow rate to the MINIMUM flow rate information previously recorded.
- If the TESTED flow rate is equal to or greater than the MINIMUM flow rate recorded, the oil cooling system is functioning properly. Perform Code Recording Procedure.
- If the TESTED flow rate is less than the MINIMUM flow rate previously recorded, repeat the back flush and forward flush procedures.
If the TESTED flow rate is less than the MINIMUM flow rate after the second test, perform Code Recording Procedure.
1. 3.1. Replace the transmission oil cooler.
2. 3.2. Reconnect supply and waste hoses to the cooler lines in the normal flow direction. Perform Flow Test.
3. 3.3. Perform Code Recording Procedure.