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 DIAGNOSISTECHNICAL SERVICE BULLETINSALL TECHNICAL SERVICE BULLETINSA/C - SYSTEMS WITH R12 OR R134A SERVICE ISSUESERVICING R134A RETROFITTED VEHICLE SYSTEMS
1990 Chevrolet Lumina APV V6-191 3.1L
Servicing R134A Retrofitted Vehicle Systems
1990 Chevrolet Lumina APV V6-191 3.1LSECTION Servicing R134A Retrofitted Vehicle Systems
Servicing R134a Retrofitted Vehicle Systems
Vehicles retrofitted from R12 to R134a use conversion fittings on the high and low side R12 service ports which allow connection to your R134a recovery equipment. When servicing a previously retrofitted vehicle, there is concern that if all of the R12 was not removed during the retrofit procedure, your R134a equipment and recovery tank will become contaminated.
Vehicles retrofitted from R12 to R134a use conversion fittings on the high and low side R12 service ports which allow connection to your R134a recovery equipment. When servicing a previously retrofitted vehicle, there is concern that if all of the R12 was not removed during the retrofit procedure, your R134a equipment and recovery tank will become contaminated.
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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.