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 HVACDESCRIPTION AND OPERATIONGENERAL DESCRIPTION
1990 Chevrolet Lumina APV V6-191 3.1L
General Description
1990 Chevrolet Lumina APV V6-191 3.1LSECTION General Description
V5 Compressor V-Groove Pulley & Standard Mounting:
V5 Compressor Front Head Orientation:
V5 Compressor Rear Head Details:
V5 Compressor - Cross Section:
Vehicles using the V5 compressor may have differences between installations in the mounting brackets, drive Systems, pulleys, connections, and system capacities. Basic overhaul procedures are similar between compressors used on different vehicles.
When servicing the compressor, keep dirt and foreign material from getting on or into the compressor parts and system. Clean tools and a clean work area are important for proper service. The compressor connections and the outside of the compressor should be cleaned before any "on car" repairs, or before removal of the compressor. The parts must be kept clean at all times and any parts to be reassembled should be cleaned with Trichloroethane, naptha, stoddard solvent, kerosene or equivalent solvent and dried with dry air. Use only lint free cloths to wipe parts.
The operations described are based on bench overhaul with the compressor removed from the car, except as noted. They have been prepared in order of accessibility of the components. When a compressor is removed from the car for servicing, the amount of oil remaining in the compressor should be drained and measured. This oil should then be discarded and new 525 viscosity refrigerant oil added to the compressor.
NOTICE: It is important that the oil drain plug be removed and the oil drained thru the plug opening to insure complete draining of oil from the compressor.
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:
- β’ You smell fuel, burning insulation, or see smoke.
- β’ Brakes feel soft, pull hard to one side, or make grinding noises.
- β’ The engine overheats, stalls repeatedly, or misfires under load.
- β’ You are missing required tools, torque specs, or safe lifting equipment.
- β’ You are not confident in the next step or safety outcome.