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 CONDITIONINGTECHNICAL SERVICE BULLETINS
1990 Chevrolet Lumina APV V6-191 3.1L
Heating and Air Conditioning: Technical Service Bulletins
1990 Chevrolet Lumina APV V6-191 3.1LSECTION Technical Service Bulletins
- Customer Interest
- By Symptom
- Customer Interest
- Erratic Operation
- False instrument warning light/gauges
- Leaks
- Noise
- Odors
- All Technical Service Bulletins
- Vehicle - Engine And Sub Systems Flushing Info. (CANADA)
- Vehicle - Engine And Sub-Systems Flushing Recommendations
- Body - Broken Rear Window Defogger Grid Detection
- A/C - Musty Odors Emitted From (HVAC) System
- A/C - PureGuard 2 Operating Alert
- A/C - Tool And Equipment Maintenance
- A/C - Retrofitting R-12 to R-134a
- A/C - Systems With R12 Or R134a Service Issue
- Tools - A/C Leak Detector Maintenance Kit Availability
- Electrical Systems - Revised Diagnostic Schematics
- A/C Refrigerant - Contamination
- HVAC System - Clarification of Content & Option Codes
- A/C - CFC Reduction & Refrigerant Recovery Recycling
- A/C - Erratic HVAC Operation & Self Diagnostic Blinks
- A/C - Revised V-Dot Diagnosis Charts
- A/C Compressor Oval O-Ring Seal - Revised Design
- A/C - New Compressor Sealing Washer
- A/C - Missing Washers From Replacement Compressors
- A/C Shaft Nut - Removal (Elimination) From Compressor
- A/C - Shaft Nut Removal from the HR6HE Compressor
- A/C Compressor Seal Washer - Reference Chart
- A/C - Noise At Highway Speeds/Certain Heater Positions
- Blower Motor - Revised Diagnosis
- Evaporator Core, Front - Revised R&R Procedure
- Heater Core - Revised Service Procedure
- A/C - Refrigerant Loss Prevention
- Isolation Diodes - Replacement Information
- A/C - Use of Alternate Refrigerants In CFC 12
- Contaminated R12 Refrigerant - Testing & Handling
- A/C - R12 or R134a Service Recommendations
- A/C - Retrofitting R-12 Vehicles to R-134A
- A/C Evaporator Drain - Water Leaks Into Front of Vehicle
- Cooling System, A/C - Aluminum Heater Cores/Radiators
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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.