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Home >> Chevrolet >> 2015 >> Cruze LT, Automatic Trans >> Repair and Diagnosis >> Engine Mechanical >> Cooling System (Mechanical) >> Engine Cooling System >> Diagnostic Information and Procedures >> Cooling Fan Always On (LUV, LUW or LWE) >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect each KR20 cooling fan relay one at a time, in the order listed below, ignition ON:
    NOTE: The following tests must be performed on each cooling fan relay.
    • KR20F Cooling Fan Relay
    • KR20C Cooling Fan Low Speed Relay
    • KR20P Cooling Fan Medium Speed Relay
    • KR20D Cooling Fan High Speed Relay
  2. Verify that the cooling fan is not activated after each relay is removed.
    • If the cooling fan is ON with all of the listed relays removed 
    1. Ignition OFF, disconnect the harness connector at the G10 Cooling Fan Motor, ignition ON.
    2. Test for less than 1 V between ground and the relay controlled output circuit terminal listed below:
      • KR20C Cooling Fan Low Speed Relay terminal 87/5
      • KR20P Cooling Fan Medium Speed Relay terminal 30/3
      • KR20D Cooling Fan High Speed Relay terminal 30/3
      • If 1 V or greater, repair the short to voltage in the appropriate circuit.
    • If the cooling fan is OFF after a listed relay is removed 
  3. Replace the appropriate KR20 Cooling Fan Relay.
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