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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> Engine Mechanical >> Cooling System (Mechanical) >> Engine Cooling >> Diagnostic Information and Procedures >> Cooling Fan Always On >> Circuit/System Testing

Circuit/System Testing

IMPORTANT: You must perform the Circuit/System Verification before proceeding with Circuit/System Testing.
  1. Ignition OFF, leave the series/parallel relay in place while disconnecting the other relays.
  2. Ignition ON, observe that the fans are not activated.
    • If the fans are not activated, replace the faulty relay.
    • If a fan is activated, test the fan voltage supply circuits for a short to voltage.
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