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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 Inoperative (LE5) >> Circuit/System Verification

Circuit/System Verification

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. Verify that the following DTCs are not set: P0480 or P0481.
    • If any of the DTCs are set, repair the DTC first.
  2. Verify cooling fan operation using the scan tool commands listed below:
    • Fan Relay 3 ON-Both fans run at low speed.
    • Fan Relays 1 and 2 ON-The main fan runs at high speed, the AUX fan is OFF.
    • Fan Relays 1, 2, and 3 ON-Both fans run at high speed.
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