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HOMESERVICE MANUALSCHEVROLET1993ASTRO VAN M V6-262 4.3L VIN ZREPAIR AND DIAGNOSISHEATING AND AIR CONDITIONINGCOMPRESSOR HVACCOMPRESSOR CLUTCHTESTING AND INSPECTION
1993 Chevrolet Astro Van M V6-262 4.3L VIN Z

Compressor Clutch: Testing and Inspection

1993 Chevrolet Astro Van M V6-262 4.3L VIN ZSECTION Testing and Inspection


PCM

A/C Request Signal Circuit (PCM):





VCM

A/C Request Signal Circuit (VCM):






Circuit and Test Description:
Turning "ON" the air conditioning supplies CKT 59 battery voltage to the A/C compressor clutch and to terminal "C6 with VCM" and "E12 with PCM" of the control module connector to increase and maintain idle speed.

The control module does not control the A/C compressor clutch, therefore, if A/C does not function, refer to the A/C section.

If A/C is operating properly and idle speed dips too low when the A/C compressor turns "ON" or flares too high when the A/C compressor turns "OFF", check for an open CKT 59 to the control module. If circuits are OK, it is a faulty control module connector terminal "E12 with PCM", "C6 with VCM" or control module.
RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.