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 - Erratic HVAC Operation & Self Diagnostic Blinks
  • A/C Compressor - Loud Knocking Noise
  • A/C - Odor at Start up in Humid Climates
  • A/C - Whistle Noise at High Blower Motor Speeds
  • A/C Control Head - Flashes, Operates Erratically
  • Manual Temp Control Lever - Slips From Hot To Cold
• 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
    • A/C - Erratic HVAC Operation & Self Diagnostic Blinks
    • A/C Compressor - Loud Knocking Noise
    • A/C - Odor at Start up in Humid Climates
    • A/C - Whistle Noise at High Blower Motor Speeds
    • A/C Control Head - Flashes, Operates Erratically
    • Manual Temp Control Lever - Slips From Hot To Cold
  • Erratic Operation
    • A/C - Erratic HVAC Operation & Self Diagnostic Blinks
    • A/C Control Head - Flashes, Operates Erratically
    • Manual Temp Control Lever - Slips From Hot To Cold
  • False instrument warning light/gauges
    • A/C - Erratic HVAC Operation & Self Diagnostic Blinks
  • Leaks
    • A/C - R134a Leak Detection With Tracer Dye
  • Loose
    • Manual Temp Control Lever - Slips From Hot To Cold
  • Noise
    • A/C Compressor - Loud Knocking Noise
    • A/C - Whistle Noise at High Blower Motor Speeds
  • Odors
    • A/C - Musty Odors Emitted From (HVAC) System
    • A/C - Odor at Start up in Humid Climates
• 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
  • 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
  • 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 - Insufficient Cooling Diagnosis Table Updated
  • Heater and A/C Controls - Revised Diagnosis Test F
  • HVAC Controls - Diagnostic Testing Updates
  • Tools - A/C Leak Detector Maintenance Kit Availability
    • Overview
    • Service Procedure
  • Air Conditioning - Updated Information
  • A/C Refrigerant - Contamination
  • A/C - Erratic HVAC Operation & Self Diagnostic Blinks
  • A/C Compressor - Loud Knocking Noise
  • A/C Compressor Seal Washer - Reference Chart
  • A/C - Unnecessary Compressor Replacement
  • A/C - Odor at Start up in Humid Climates
  • A/C - Whistle Noise at High Blower Motor Speeds
  • A/C Control Head - Flashes, Operates Erratically
  • Manual Temp Control Lever - Slips From Hot To Cold
  • A/C - R134a Leak Detection With Tracer Dye
  • 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 - New PAG Oil
  • A/C - Contaminated R134A Refrigerant
  • A/C - Refrigerant Recovery/Recycling/Equipment
  • Cooling System, A/C - Aluminum Heater Cores/Radiators