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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 463 (Engine Cooling System) >> Diagnostic Information and Procedures >> Cooling Fan Always On (with HP2) >> Circuit/System Testing

Circuit/System Testing

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  1. Ignition OFF, open the hood to disable the Auto-Stop function. Refer to Hybrid Modes of Operation Description .
  2. Ignition ON, verify the scan tool hood position parameter displays Open.
    3. NOTE:

    The following tests must be performed on each cooling fan relay.

  3. Ignition OFF, disconnect each cooling fan relay one at a time.
  4. Ignition ON, observe that the fans are not activated.
    • If the fans are activated, test for a short to voltage in the relay controlled output circuit.
    • If the fans are not activated, test or replace the appropriate cooling fan relay.
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