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 MANUALSCHEVROLET1990G 20 VAN V8-350 5.7LREPAIR AND DIAGNOSISHEATING AND AIR CONDITIONINGCOMPRESSOR HVACSERVICE AND REPAIRCOMPRESSOR REPLACEMENT
1990 Chevrolet G 20 Van V8-350 5.7L
Compressor Replacement
1990 Chevrolet G 20 Van V8-350 5.7LSECTION Compressor Replacement
Compressor Installation (Serpentine Belt):
Remove or Disconnect
1. Battery ground cable.
2. Compressor clutch connector
3. Refrigerant from the system.
4. Belt.
^ Loosen the idler pulley adjustment screw.
5. Engine cover
6. Air cleaner
7. Fitting and muffler assembly.
^ Cap or plug all open connections.
8. Mounting bracket bolts.
9. Compressor bracket.
10. Engine oil tube support bracket bolt and nut.
11. Clutch ground lead.
12. Compressor
Important
^ Drain and measure the oil. Check for contamination.
Install or Connect
1. Oil to the compressor
Important
^ Replace with fresh oil. If the system was serviced, install a full, fresh charge of refrigerant oil.
2. Compressor.
^ Position to the mounting bracket.
3. Mounting bracket bolts.
4. Connector assembly to the rear of the compressor
Important
^ Use new seals (O-rings) coated with clean refrigerant oil.
5. Electrical lead to the coil.
6. Compressor belt.
Adjust
^ Tighten the idler pulley adjustment screw. Measure the belt tension with J23600-B.
7. Battery ground cable.
8. Refrigerant to the system.
^ Evacuate, charge and leak test.
9. Air Cleaner.
10. Engine cover
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.