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 - Whistle Noise When Coming Off Full Hot Setting
  • A/C - Inoperative or No Cooling
  • Heater Duct - Condensation Drips
  • A/C - Little/No Air Flow From Side Window Defroster Duct
  • A/C - Window Fogs Up In Defrost Mode
  • Ambient Temperature Display - Inaccurate
  • A/C - Temperature Uneven Side to Side
  • Automatic Temperature Control - Erratic Performance
  • A/C Control - Does Not Immediately Control Temperature
  • A/C - Inoperative/No Codes Stored
  • A/C Temperature Doors - Whistling Noise
  • A/C - Whistle/Flutter/Noise When Coming Off Full Heat
  • Defroster - Poor Operation
• By Symptom
  • Customer Interest
    • Body - Broken Rear Window Defogger Grid Detection
    • A/C - Musty Odors Emitted From (HVAC) System
    • A/C - Whistle Noise When Coming Off Full Hot Setting
    • A/C - Inoperative or No Cooling
    • Heater Duct - Condensation Drips
    • A/C - Little/No Air Flow From Side Window Defroster Duct
    • A/C - Window Fogs Up In Defrost Mode
    • Ambient Temperature Display - Inaccurate
    • A/C - Temperature Uneven Side to Side
    • Automatic Temperature Control - Erratic Performance
    • A/C Control - Does Not Immediately Control Temperature
    • A/C - Inoperative/No Codes Stored
    • A/C Temperature Doors - Whistling Noise
    • A/C - Whistle/Flutter/Noise When Coming Off Full Heat
    • Defroster - Poor Operation
  • Erratic Operation
    • A/C - Temperature Uneven Side to Side
    • Automatic Temperature Control - Erratic Performance
    • A/C Control - Does Not Immediately Control Temperature
  • False instrument warning light/gauges
    • Ambient Temperature Display - Inaccurate
  • Inoperative
    • A/C - Inoperative or No Cooling
    • A/C - Little/No Air Flow From Side Window Defroster Duct
    • A/C - Window Fogs Up In Defrost Mode
    • A/C - Inoperative/No Codes Stored
  • Leaks
    • A/C - Leak Test
    • Heater Duct - Condensation Drips
  • Loose
    • A/C System - Refrigerant Loss Prevention
  • Noise
    • A/C - Whistle Noise When Coming Off Full Hot Setting
    • A/C Temperature Doors - Whistling Noise
    • A/C - Whistle/Flutter/Noise When Coming Off Full Heat
  • Odors
    • A/C - Musty Odors Emitted From (HVAC) System
  • Poor performance
    • A/C - Little/No Air Flow From Side Window Defroster Duct
    • A/C Control - Does Not Immediately Control Temperature
    • Defroster - Poor Operation
• 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
  • Passenger Climate Control Assembly Test - Manual Update
  • 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
  • A/C - Whistle Noise When Coming Off Full Hot Setting
  • Tools - A/C Leak Detector Maintenance Kit Availability
    • Overview
    • Service Procedure
  • A/C - Inoperative or No Cooling
  • A/C - Corrected Temperature Valve Actuator Test
  • A/C - Revised Diagnostic Procedures
  • A/C Refrigerant - Contamination
  • A/C - R134A Refrigerant Information
  • A/C - Leak Test
  • A/C - New Compressor Sealing Washer
  • A/C Compressor Shaft Nut - Removal (Discontinued)
  • A/C Compressor Seal Washer - Reference Chart
  • Heater Duct - Condensation Drips
  • A/C - Little/No Air Flow From Side Window Defroster Duct
  • A/C - Window Fogs Up In Defrost Mode
  • Dual A/C - Revised Blower Motor Test Chart
  • Ambient Temperature Display - Inaccurate
  • A/C - Temperature Uneven Side to Side
  • Automatic Temperature Control - Erratic Performance
  • ABS & A/C- Diagnosis/Data Line Update
  • A/C System - Refrigerant Loss Prevention
  • A/C Control - Does Not Immediately Control Temperature
  • A/C - Revised On-Board Diagnosis
  • A/C Programmer - Revised Replacement Procedure
  • A/C - Inoperative/No Codes Stored
  • A/C Temperature Doors - Whistling Noise
  • A/C - Whistle/Flutter/Noise When Coming Off Full Heat
  • Defroster - Poor Operation
  • A/C - R134A Non Warranty Retrofit
  • 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
  • A/C - Information On the Use of Alternate Refrigerants
  • Cooling System, A/C - Aluminum Heater Cores/Radiators