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 - Excessive Heat On Driver's Foot
  • A/C - Unbalanced Defroster Performance
  • A/C - Whistle Type Noise When in Recirculate Mode
  • A/C - Whistle Noise
  • A/C - Noise or Vibration Coming Off Full Heat Position
• 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 - Excessive Heat On Driver's Foot
    • A/C - Unbalanced Defroster Performance
    • A/C - Whistle Type Noise When in Recirculate Mode
    • A/C - Whistle Noise
    • A/C - Noise or Vibration Coming Off Full Heat Position
  • Erratic Operation
    • A/C - Excessive Heat On Driver's Foot
    • A/C - Unbalanced Defroster Performance
  • Leaks
    • A/C - Whistle Noise
  • Noise
    • A/C - Whistle Noise When Coming Off Full Hot Setting
    • A/C - Whistle Type Noise When in Recirculate Mode
    • A/C - Whistle Noise
    • A/C - Noise or Vibration Coming Off Full Heat Position
  • Odors
    • A/C - Musty Odors Emitted From (HVAC) System
  • Poor performance
    • A/C - Unbalanced Defroster Performance
  • Vibration
    • A/C - Noise or Vibration Coming Off Full Heat Position
• 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
  • A/C - Self Diagnostics & Dual Zone Connector ID
  • A/C - Whistle Noise When Coming Off Full Hot Setting
  • Tools - A/C Leak Detector Maintenance Kit Availability
    • Overview
    • Service Procedure
  • A/C - Revised Wire Color On Diagnostic Chart
  • A/C & Instrument Panel - Revised Wiring/Diagnostics
  • A/C - Wiring Diagram & Air Delivery Diagnosis Revised
  • A/C - Info On Aluminum Nuts & Joint Seal Gaskets
  • A/C - Excessive Heat On Driver's Foot
  • A/C Refrigerant - Contamination
  • A/C - CFC Reduction and Refrigerant Recovery/Recycling
  • A/C - Leak Test
  • Electrical - Diagram Revisions for Various Systems
  • A/C - Compressor Sealing Washer Usage
  • A/C Compressor Shaft Nut - Eliminated
  • A/C Compressor Seal Washer - Reference Chart
  • A/C - Unbalanced Defroster Performance
  • Expansion (Orifice) Tube - Revised Installation
  • A/C - Whistle Type Noise When in Recirculate Mode
  • A/C - Use of Alternate Refrigerants Other Than R-12
  • 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 - Whistle Noise
  • A/C - Noise or Vibration Coming Off Full Heat Position
  • Cooling System, A/C - Aluminum Heater Cores/Radiators