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Home >> Buick >> 2015 >> Regal GS, AWD >> Repair and Diagnosis >> Engine Mechanical >> Cooling System (Mechanical) >> Engine Cooling System >> Diagnostic Information and Procedures >> Cooling Fan Always On >> Component Testing

Component Testing

  1. Ignition OFF.
  2. Disconnect a KR20 Cooling Fan Relay.
  3. Test for 70-110Ω between terminals 85/2 and 86/1.
    • If less than 70Ω or greater than 110Ω 

      Replace the KR20 Cooling fan relay.

    • If between 70-110Ω 
  4. Test for infinite resistance between the following terminals:
    • 30/3 and 86/1
    • 30/3 and 87/5
    • 30/3 and 85/2
    • 85/2 and 87/5
    • If less than infinite resistance 

      Replace the KR20 Cooling Fan Relay.

    • If infinite resistance 
    5. NOTE:

    This test only applies to the speed control relay.

  5. Test for less than 2Ω between KR20E Cooling Fan Speed Control Relay terminals 30/3 and 87A/4.
    • If 2Ω or greater 

      Replace the KR20E Cooling Fan Speed Control Relay.

    • If less than 2Ω 
  6. Install a 10A fused jumper wire between relay terminal 85 or 2 and 12V.
  7. Install a jumper wire between relay terminal 86 or 1 and ground.
  8. Test for less than 2Ω between terminals 30/3 and 87/5.
    • If 2Ω or greater 

      Replace the KR20 Cooling Fan Relay.

    • If less than 2Ω 
  9. All OK.
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