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 MANUALSCHEVROLET1988CHEVY VAN G30, 4.3 ZREPAIR AND DIAGNOSISHEATING, VENTILATION & A/C (HVAC)HVAC CONTROL SYSTEMSA/C-TESTING, TROUBLE SHOOTING & DIAGNOSIS - MANUALOPERATIONAL TESTING
1988 Chevrolet Chevy Van G30, 4.3 Z
Operational Testing
1988 Chevrolet Chevy Van G30, 4.3 ZSECTION Operational Testing
When trouble shooting and diagnosing an air conditioning system, always refer to the appropriate vacuum and wiring diagrams for the system involved. Refer to the applicable operational chart for characteristics, and note the following:
- Blower operation at all 4-speeds and engagement of the compressor clutch would indicate that electrical circuits are functioning properly.
- If evaporator inlet pipe AND accumulator surface both appear to be the same temperature when felt by hand, system is properly charged with refrigerant.
- An indication of proper vacuum and diaphragm function is selector lever operation.
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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.