Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET1986CHEVY VAN G20, 5.0 H, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)HEATING, VENTILATION & A/C (HVAC)HVAC CONTROL SYSTEMSA/C SYSTEM DIAGNOSIS - MANUALAIR CONDITIONER DOESN'T WORK
1986 Chevrolet Chevy Van G20, 5.0 H, Standard
Air Conditioner Doesn't Work
1986 Chevrolet Chevy Van G20, 5.0 H, StandardSECTION Air Conditioner Doesn't Work
NOTE:
To check Celebrity, Citation II with 2.5L or 2.8L engine, Pontiac Fiero with 2.5L engine or 2000 with 1.8L EFI, 1.8L Turbo or 2.0L EFI engine, see appropriate ECM Controlled Test Table in this article.
- With engine running and mode lever at "NORM" position, check for voltage at pressure cycling switch.
- Check for voltage between pressure cycling switch and compressor clutch.
- Ground compressor clutch circuit. If clutch engages, check wide-open throttle cut-out switch and A/C compressor cut-off switch.
RENDER: 1.0x
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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.