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A/C Compressor Clutch Does Not Disengage: Diesel

  1. Turn ignition switch to ON position. Remove A/C Compressor Clutch Relay. If A/C compressor clutch disengages, go to step  5. If A/C compressor clutch does not disengage, go to next step.
  2. Using DVOM, measure voltage between A/C compressor clutch relay connector terminal A6 (Dark Green wire) and ground. If voltage is greater than 0.5 volt, go to next step. If voltage is not greater than 0.5 volts, go to step  4.
  3. Repair short to battery voltage in Dark Green wire between A/C compressor clutch relay and A/C compressor clutch. After repairs, recheck system operation.
  4. Replace A/C compressor clutch. See appropriate COMPRESSOR SERVICING article in GENERAL SERVICING. After repairs, recheck system operation.
  5. Connect fused jumper between A/C compressor clutch relay connector terminal A4 (Pink wire) and battery voltage. Connect second jumper between A/C compressor clutch relay connector terminal B6 (Dark Green/White wire) and ground. If relay clicks, go to step  7. If relay does not click, go to next step.
  6. Replace A/C Compressor Clutch Relay. After repairs, recheck system operation.
  7. Turn ignition switch to OFF position. Using DVOM, measure continuity between A/C compressor clutch relay connector terminal B6 (Dark Green/White wire) and ground. If continuity is present, go to next step. If continuity does not exist, go to step  9.
  8. Repair short to ground in Dark Green/White wire between A/C compressor clutch relay and PCM. After repairs, recheck system operation.
  9. Turn ignition switch to ON position. Disconnect HVAC Control Module connector C3. Using DVOM, measure voltage between PCM connector C1 terminal C2 (Dark Green/White wire) and ground. If battery voltage is present, go to step  11. If battery voltage is not present, go to next step.
  10. Replace HVAC control module. See A/C-HEATER CONTROL ASSEMBLY  under REMOVAL & INSTALLATION. After repairs, recheck system operation.
  11. Repair short to battery voltage in Light Green wire, Dark Green wire or Dark Green/White wire between HVAC control module and PCM. After repairs, recheck system operation.
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