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A/C Condenser Fan System Diagnosis

NOTE: Ensure A/C system is fully charged and all other A/C components are functioning properly before performing this test.
  1. Turn ignition switch to RUN position. Turn A/C on. Turn blower switch to high. If A/C condenser fan operates, go to next step. If A/C fan does not operate, go to step 3).
  2. Turn A/C and blower switch off. If A/C condenser fan stops operating, A/C condenser fan is operating properly at this time. If A/C condenser fan continues to operate, go to step 8).
  3. Disconnect A/C condenser fan harness connector. Connect test light between A/C condenser fan harness connector terminals. If test light does not illuminate, go to next step. If test light illuminates, replace A/C condenser fan.
  4. Using a test light connected to ground, probe terminal No. 1 (Blue/White wire) at A/C condenser fan harness connector. If test light does not illuminate, go to next step. If test light illuminates, repair open inA/C condenser fan ground circuit (Black wire).
  5. Using a test light connected to ground, backprobe A/C condenser fan relay terminal No. 4 (Blue/Black wire). If test light does not illuminate, go to next step. If test light illuminates, repair open in Blue/Black wire between A/C condenser fan relay and A/C condenser fan harness connectors.
  6. Remove A/C condenser fan relay. Using a test light connected to battery voltage, probe terminal No. 3 (Blue/Red wire) at A/C condenser fan relay harness connector. If test light does not illuminate, go to next step. If test light illuminates, check for open in Yellow wire between dual-pressure switch and A/C condenser relay harness connectors. Also check for open in Red wire between A/C fuse and A/C condenser fan relay harness connector. If open exists, repair as necessary. If open does not exist, replace A/C condenser fan relay.
  7. Using a test light connected to battery voltage, backprobe terminal No. 6 (Blue/Red wire) at A/C amplifier. If test light illuminates, repair open in Blue/Red wire between A/C amplifier and A/C condenser fan relay. If test light does not illuminate, replace A/C amplifier.
  8. Remove A/C condenser fan relay. If A/C condenser fan does not continue to operate, go to next step. If A/C condenser fan continues to operate, repair short to voltage in Blue/Black wire between A/C condenser fan relay and A/C condenser fan.
  9. Using a test light connected to battery voltage, probe terminal No. 3 (Blue/Black wire) at A/C condenser fan relay harness connector. If test light does not illuminate, replace A/C condenser fan relay. If test light illuminates, check Blue/Red wire between A/C condenser fan relay and A/C amplifier for short to ground. If short to ground exists, repair as necessary. If short to ground does not exist, repair compressor control circuit as necessary. See A/C-HEATER SYSTEM article in AIR CONDITIONING & HEAT section.
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