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Home >> GMC >> 2006 >> Sierra 1500 HD, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1539 (Engine Cooling System - Non-Hybrid) >> Diagnostic Information and Procedures >> Cooling Fan Always On (without HP2) >> Circuit/System Testing

Circuit/System Testing

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    NOTE: The following tests must be performed on each cooling fan relay.
  1. Ignition OFF, disconnect each cooling fan relay one at a time.
  2. 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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