Heating and Air Conditioning: Technical Service Bulletins

• Customer Interest
  • Body - Broken Rear Window Defogger Grid Detection
  • A/C - Musty Odors Emitted From (HVAC) System
  • Steering - Steering Wheel Mounted Controls Rattle
  • A/C - Whistle Noise When Coming Off Full Hot Setting
  • A/C - Reduced Performance/Airflow Restriction
  • A/C - Hissing Noise in Instrument Panel
  • A/C - Excessive Heat On Driver's Foot
  • A/C - Too Warm On Extended Idle
  • A/C - Reverts to Econ Mode, Compressor Inop. and Code 48
  • A/C - Unbalanced Defroster Performance
  • Heater - Poor Heat Distribution or Flow From Outlet
  • A/C - Poor Performance During Long Idle Periods
  • A/C - Odor at Start up in Humid Climates
  • Auto Climate Control System - Poor Performance
  • A/C - Whistling Noise When in Recirculate Mode
• 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
    • Steering - Steering Wheel Mounted Controls Rattle
    • A/C - Whistle Noise When Coming Off Full Hot Setting
    • A/C - Reduced Performance/Airflow Restriction
    • A/C - Hissing Noise in Instrument Panel
    • A/C - Excessive Heat On Driver's Foot
    • A/C - Too Warm On Extended Idle
    • A/C - Reverts to Econ Mode, Compressor Inop. and Code 48
    • A/C - Unbalanced Defroster Performance
    • Heater - Poor Heat Distribution or Flow From Outlet
    • A/C - Poor Performance During Long Idle Periods
    • A/C - Odor at Start up in Humid Climates
    • Auto Climate Control System - Poor Performance
    • A/C - Whistling Noise When in Recirculate Mode
  • Erratic Operation
    • A/C - Excessive Heat On Driver's Foot
    • A/C - Unbalanced Defroster Performance
  • Inoperative
    • A/C - Inoperative
    • A/C - Reverts to Econ Mode, Compressor Inop. and Code 48
  • Leaks
    • A/C - R134a Leak Detection With Tracer Dye
  • Noise
    • Steering - Steering Wheel Mounted Controls Rattle
    • A/C - Whistle Noise When Coming Off Full Hot Setting
    • A/C - Hissing Noise in Instrument Panel
    • A/C - Whistling Noise When in Recirculate Mode
  • Odors
    • A/C - Musty Odors Emitted From (HVAC) System
    • A/C - Odor at Start up in Humid Climates
  • Poor performance
    • A/C - Reduced Performance/Airflow Restriction
    • A/C - Too Warm On Extended Idle
    • A/C - Reverts to Econ Mode, Compressor Inop. and Code 48
    • A/C - Unbalanced Defroster Performance
    • Heater - Poor Heat Distribution or Flow From Outlet
    • A/C - Poor Performance During Long Idle Periods
    • Auto Climate Control System - Poor Performance
• 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 - R-134a System Flushing Procedures
  • Steering - Steering Wheel Mounted Controls Rattle
  • A/C - R-134A Refrigerant Information
  • 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 - Inoperative
  • A/C - Whistle Noise When Coming Off Full Hot Setting
  • Tools - A/C Leak Detector Maintenance Kit Availability
    • Overview
    • Service Procedure
  • A/C - Reduced Performance/Airflow Restriction
  • A/C - Hissing Noise in Instrument Panel
  • A/C - Excessive Heat On Driver's Foot
  • A/C Refrigerant - Contamination
  • A/C - Too Warm On Extended Idle
  • A/C - Reverts to Econ Mode, Compressor Inop. and Code 48
  • A/C - Revised Display Illumination Control Test
  • Electrical Systems - Isolation Diode Replacement
  • A/C Compressor Seal Washer - Reference Chart
  • A/C - Unnecessary Compressor Replacement
  • A/C - Unbalanced Defroster Performance
  • Heater - Poor Heat Distribution or Flow From Outlet
  • A/C - Poor Performance During Long Idle Periods
  • HVAC Blower Motor - Revised Replacement Parts
  • A/C - Odor at Start up in Humid Climates
  • Expansion (Orifice) Tube - Revised Installation
  • Auto Climate Control System - Poor Performance
  • HVAC Programmer - Revised R&R Procedure
  • A/C - R134a Leak Detection With Tracer Dye
  • 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 - Refrigerant Recovery/Recharge Equipment
  • A/C - Whistling Noise When in Recirculate Mode
  • A/C - Contaminated R134A Refrigerant
  • Cooling System, A/C - Aluminum Heater Cores/Radiators