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Home >> GMC >> 2000 >> C3500 HD 6.5 F, Standard >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> HVAC System - Manual - Escalade, Pickup, TAHOE & YUKON >> Trouble Shooting >> A/C Compressor Clutch Does Not Disengage >> Except Diesel

Except Diesel

  1. Turn ignition switch to ON position. Remove A/C compressor clutch relay. If compressor clutch disengages, go to step  5. If 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 volt, go to step  4.
  3. Repair short to battery voltage 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 terminal A4 and battery voltage. Connect jumper wire between A/C compressor clutch relay terminal B6 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, check 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 is not present, go to step  9.
  8. Repair short to ground between A/C Compressor Clutch Relay and VCM. After repairs, recheck system operation.
  9. Turn ignition switch to ON position. Disconnect HVAC Control Module connector C3. Using DVOM, measure voltage between VCM connector C3 terminal No. 25 (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 or Dark Green/White wire between HVAC control module and VCM. After repairs, recheck system operation.
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