Heating and Air Conditioning: Technical Service Bulletins

• Customer Interest
  • Body - Broken Rear Window Defogger Grid Detection
  • A/C - Musty Odors Emitted From (HVAC) System
  • A/C - Poor Performance
    • Overview
    • Service Procedures
  • A/C - Delayed Cooling After Engine Start Up
  • Defroster Outlet - Delamination Condition
  • A/C - Erratic HVAC Operation & Self Diagnostic Blinks
  • A/C - Noise/Vibration
  • A/C - Freon Leaks, New O Rings
  • A/C - Compressor Vibration, Moan Noise
  • Heater- Insufficient Heat to the Driver's Floor Area
  • A/C - R12 Loss From Loose or Missing Access Fitting Caps
• By Symptom
  • Abnormal wear/deterioration
    • Defroster Outlet - Delamination Condition
    • A/C - Use of R-22 Refrigerant Not Recommended
  • Customer Interest
    • Body - Broken Rear Window Defogger Grid Detection
    • A/C - Musty Odors Emitted From (HVAC) System
    • A/C - Poor Performance
      • Overview
      • Service Procedures
    • A/C - Delayed Cooling After Engine Start Up
    • Defroster Outlet - Delamination Condition
    • A/C - Erratic HVAC Operation & Self Diagnostic Blinks
    • A/C - Noise/Vibration
    • A/C - Freon Leaks, New O Rings
    • A/C - Compressor Vibration, Moan Noise
    • Heater- Insufficient Heat to the Driver's Floor Area
    • A/C - R12 Loss From Loose or Missing Access Fitting Caps
  • Erratic Operation
    • A/C - Delayed Cooling After Engine Start Up
    • A/C - Erratic HVAC Operation & Self Diagnostic Blinks
  • False instrument warning light/gauges
    • A/C - Erratic HVAC Operation & Self Diagnostic Blinks
  • Leaks
    • A/C - Freon Leaks, New O Rings
    • A/C - New O Rings Reduce System Leak Potential
    • A/C - R12 Loss From Loose or Missing Access Fitting Caps
  • Loose
    • Defroster Outlet - Delamination Condition
    • A/C - R12 Loss From Loose or Missing Access Fitting Caps
  • Noise
    • A/C - Noise/Vibration
    • A/C - Compressor Vibration, Moan Noise
  • Odors
    • A/C - Musty Odors Emitted From (HVAC) System
  • Poor performance
    • A/C - Poor Performance
      • Overview
      • Service Procedures
    • Heater- Insufficient Heat to the Driver's Floor Area
    • A/C - R12 Loss From Loose or Missing Access Fitting Caps
  • Vibration
    • A/C - Noise/Vibration
  • Warping
    • Defroster Outlet - Delamination Condition
• 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
    • Overview
    • Refrigerant Recovery
    • Oil Injection and Refrigerant Charging
    • Additional ACR4 Operation and Maintenance Tips
    • Tank-to-Tank Refrigerant Transfer
    • Excess Air In Tank
    • Pureguard 2 Error Codes
    • Active Flow Control
  • A/C - Tool And Equipment Maintenance
  • A/C - Retrofitting R-12 to R-134a
    • Overview
    • A. Retrofit Procedure
      • Notes on Retrofit
      • Compressors
      • Accumulator /Dryer
      • High Pressure Cut-Off Switch (HPCOS)
      • Platform Details
      • Compressor Replacement Chart
      • Compressor Availability
      • Geo Models
      • 1985-88 Nova, 1989-93 Prizm (S)
      • 1985-88 Sprint, 1989-93 Metro (M)
      • 1989-93 Tracker
      • 1985-89 Spectrum and 1990-93 Storm (R)
    • B. General Information
    • C. Parts Information
    • D. Warranty Information
  • A/C - Systems With R12 Or R134a Service Issue
    • Overview
    • R12 System Retrofitting to R134A
    • Servicing R134A Retrofitted Vehicle Systems
    • R12 and R134A Refrigerants Are Not Interchangeable
    • J 41810 Pureguard 2 R134A Refrigerant Monitor
    • Summarizing GM's A/C Service Recommendations
  • Tools - A/C Leak Detector Maintenance Kit Availability
    • Overview
    • Service Procedure
  • A/C - Poor Performance
    • Overview
    • Service Procedures
  • A/C - Delayed Cooling After Engine Start Up
  • Defroster Outlet - Delamination Condition
  • A/C Refrigerant - Contamination
  • A/C - CFC Reduction & Refrigerant Recovery Recycling
  • A/C - Erratic HVAC Operation & Self Diagnostic Blinks
  • A/C - Noise/Vibration
  • A/C - Freon Leaks, New O Rings
  • A/C - New O Rings Reduce System Leak Potential
  • A/C - Compressor Vibration, Moan Noise
  • A/C Compressor Oval O-Ring Seal - Revised Design
  • A/C - System Diagnostic Procedure
    • Overview
    • A.Observe All Safety Precautions:
    • Visual Inspection, Check Charge, Check Electrical & Clutch System
    • E.Check Refrigerant System Performance: Engine Off to Start
    • F.Diagnosis and Service Procedures
  • A/C - New Compressor Sealing Washer
  • A/C - Shaft Nut Removal from the HR6HE Compressor
  • A/C Compressor Seal Washer - Reference Chart
  • Heater- Insufficient Heat to the Driver's Floor Area
  • A/C - Refrigerant Loss Prevention
  • A/C - R12 Loss From Loose or Missing Access Fitting Caps
  • Isolation Diodes - Replacement Information
  • A/C - Use of Alternate Refrigerants In CFC 12
  • A/C - Use of R-22 Refrigerant Not Recommended
  • Contaminated R12 Refrigerant - Testing & Handling
  • A/C - R12 or R134a Service Recommendations
    • Overview
    • R12 Service Recommendations
    • R134A Service Recommendations
  • A/C - Retrofitting R-12 Vehicles to R-134A
  • Cooling System, A/C - Aluminum Heater Cores/Radiators