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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1949 (Engine Cooling System) >> Diagnostic Information and Procedures >> Cooling Fan Always On (LE5) >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2009 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect low speed fan relay, which is FAN AUX relay.
  2. Ignition ON, observe that both fans are now OFF.
    • If both fans are OFF, replace low speed relay. If either fan is still activated, remove high speed fan relay, which is FAN MAIN relay. If both fans are now OFF, replace high speed relay. If either fan is still activated, test for a short to voltage in the fan voltage supply circuit.
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