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 MANUALSCHEVROLET1990LUMINA APV V6-191 3.1LREPAIR AND DIAGNOSISHEATING AND AIR CONDITIONINGCOMPRESSOR HVACTESTING AND INSPECTIONCOMPONENT TESTS AND GENERAL DIAGNOSTICS

1990 Chevrolet Lumina APV V6-191 3.1L

Component Tests and General Diagnostics

1990 Chevrolet Lumina APV V6-191 3.1LSECTION Component Tests and General Diagnostics

A shaft seal should not be changed because of small amounts of oil found on an adjacent surface. The seal is designed to leak some oil for lubrication purposes. A shaft seal should be changed only when a large amount of sprayed oil is found, and only after actual refrigerant leakage is found by using an approved leak detection procedure.

Should a compressor shaft seal ever have to be replaced, the accumulator in this system must also be removed from the vehicle. The oil in the accumulator then must be drained, measured and replaced.

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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.