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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 153 (Automatic Transmission - 4L60-E/4L65-E/4L70-E - Service, Diagnosis & Troubleshooting) >> Automatic Transmission Oil Cooler Flushing and Flow Test (J 45096) >> Flow Test

Flow Test

WARNING: This page is about a different car, the 2007 GMC Yukon XL, 2007 GMC Yukon, 2007 Chevrolet Tahoe, 2007 Chevrolet Suburban, and 2007 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: Setting Main Function Switch To FLOW Position
    GM1212345Courtesy 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.
  1. 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.
  2. 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.
  3. If the TESTED flow rate is less than the MINIMUM flow rate after the second test, perform the Code Recording Procedure.
    1. Replace the transmission oil cooler.
    2. Connect the supply and waste hoses to the cooler lines in the normal flow direction. Perform the Flow Test.
    3. Perform the Code Recording Procedure.
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