Heating and Air Conditioning: Technical Service Bulletins

• Customer Interest
  • Body - Broken Rear Window Defogger Grid Detection
  • A/C - Musty Odors Emitted From (HVAC) System
  • Heater - Insufficient Heat Reaching Drivers Area
    • Overview
    • Service Procedure
      • Cold Air Intrusion
      • Add Reducer to Side Window Defogger Duct
      • Add Extension to the Heat Duct
  • HVAC - Poor Heat Distribution in Driver Area
  • A/C - Odor at Start up in Humid Climates
  • Heater - Loss of Heat, Only Cold Air from Air Ducts
  • A/C - Control Knob Spins Freely
• By Symptom
  • Abnormal wear/deterioration
    • A/C - R-134a System Flushing Procedures
  • Customer Interest
    • Body - Broken Rear Window Defogger Grid Detection
    • A/C - Musty Odors Emitted From (HVAC) System
    • Heater - Insufficient Heat Reaching Drivers Area
      • Overview
      • Service Procedure
        • Cold Air Intrusion
        • Add Reducer to Side Window Defogger Duct
        • Add Extension to the Heat Duct
    • HVAC - Poor Heat Distribution in Driver Area
    • A/C - Odor at Start up in Humid Climates
    • Heater - Loss of Heat, Only Cold Air from Air Ducts
    • A/C - Control Knob Spins Freely
  • Odors
    • A/C - Musty Odors Emitted From (HVAC) System
    • A/C - Odor at Start up in Humid Climates
  • Poor performance
    • Heater - Insufficient Heat Reaching Drivers Area
      • Overview
      • Service Procedure
        • Cold Air Intrusion
        • Add Reducer to Side Window Defogger Duct
        • Add Extension to the Heat Duct
    • HVAC - Poor Heat Distribution in Driver Area
    • Heater - Loss of Heat, Only Cold Air from Air Ducts
• 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
  • Electrical - Harness Connection Inspection
  • A/C - R-134a System Flushing Procedures
  • A/C - System Sealers/Leak Detection Guidelines
  • 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
  • Heater - Insufficient Heat Reaching Drivers Area
    • Overview
    • Service Procedure
      • Cold Air Intrusion
      • Add Reducer to Side Window Defogger Duct
      • Add Extension to the Heat Duct
  • A/C - Tool And Equipment Maintenance
  • 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 Compressor Seal Washer - Reference Chart
  • A/C - Unnecessary Compressor Replacement
  • HVAC - Poor Heat Distribution in Driver Area
  • A/C - Odor at Start up in Humid Climates
  • Heater - Loss of Heat, Only Cold Air from Air Ducts
  • A/C - Control Knob Spins Freely
  • A/C - R12 or R134a Service Recommendations
    • Overview
    • R12 Service Recommendations
    • R134A Service Recommendations
  • A/C - Refrigerant Recovery/Recharge Equipment
  • A/C - New PAG Oil
  • A/C - Contaminated R134A Refrigerant
  • A/C - Refrigerant Recovery/Recycling/Equipment
  • Cooling System, A/C - Aluminum Heater Cores/Radiators