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 - Noise/Vibration When Engaged
  • A/C - No LOW or LOW and MEDIUM Blower Speed
  • A/C - Erratic HVAC Operation & Self Diagnostic Blinks
  • A/C - Compressor Moan, Vibration or Noise
  • Intake Air Duct - Reduced Engine Performance
  • A/C - Uneven Air Flow At Windshield Defroster Outlet
  • A/C - Blower Motor Making Ticking Noise
  • A/C - Blower Motor Ticking Noise
  • A/C - Blower Motor Chirp or Squeak
  • A/C - Reduced Heater Performance
  • A/C - No Low/Medium Blower Speed
  • RWAL Brake Warning Light - False Code 7
    • Overview
    • Service Procedure - S/T Trucks:
    • Service Procedure - C/K Trucks:
    • Service Parts Information
    • Warranty Information
  • A/C - Updated Temperature Control Cables
  • A/C - System Locks In A/C or Heat Mode
  • A/C - Refrigerant Loss, Loose or Missing Access Fitting
  • A/C - Moan, Vibration, Noise When Compressor Engaged
  • A/C Compressor - Moan/Vibration/Noise
  • A/C Control Head - Flashes, Operates Erratically
  • Manual Temp Control Lever - Slips From Hot To Cold
  • A/C - Pressure Cycling Switch Clicking Noise
  • A/C System - Heater Case Hot Spot
  • A/C - Noise/Insufficient Cooling/Inoperative Compressor
• By Symptom
  • Abnormal wear/deterioration
    • A/C - Use of R-22 Refrigerant Not Recommended
  • Customer Interest
    • Body - Broken Rear Window Defogger Grid Detection
    • A/C - Musty Odors Emitted From (HVAC) System
    • A/C - Noise/Vibration When Engaged
    • A/C - No LOW or LOW and MEDIUM Blower Speed
    • A/C - Erratic HVAC Operation & Self Diagnostic Blinks
    • A/C - Compressor Moan, Vibration or Noise
    • Intake Air Duct - Reduced Engine Performance
    • A/C - Uneven Air Flow At Windshield Defroster Outlet
    • A/C - Blower Motor Making Ticking Noise
    • A/C - Blower Motor Ticking Noise
    • A/C - Blower Motor Chirp or Squeak
    • A/C - Reduced Heater Performance
    • A/C - No Low/Medium Blower Speed
    • RWAL Brake Warning Light - False Code 7
      • Overview
      • Service Procedure - S/T Trucks:
      • Service Procedure - C/K Trucks:
      • Service Parts Information
      • Warranty Information
    • A/C - Updated Temperature Control Cables
    • A/C - System Locks In A/C or Heat Mode
    • A/C - Refrigerant Loss, Loose or Missing Access Fitting
    • A/C - Moan, Vibration, Noise When Compressor Engaged
    • A/C Compressor - Moan/Vibration/Noise
    • A/C Control Head - Flashes, Operates Erratically
    • Manual Temp Control Lever - Slips From Hot To Cold
    • A/C - Pressure Cycling Switch Clicking Noise
    • A/C System - Heater Case Hot Spot
    • A/C - Noise/Insufficient Cooling/Inoperative Compressor
  • Driveability
    • Intake Air Duct - Reduced Engine Performance
  • Erratic Operation
    • A/C - No LOW or LOW and MEDIUM Blower Speed
    • A/C - Erratic HVAC Operation & Self Diagnostic Blinks
    • A/C - Updated Temperature Control Cables
    • 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
    • RWAL Brake Warning Light - False Code 7
      • Overview
      • Service Procedure - S/T Trucks:
      • Service Procedure - C/K Trucks:
      • Service Parts Information
      • Warranty Information
  • Inoperative
    • A/C - No Low/Medium Blower Speed
    • A/C - Noise/Insufficient Cooling/Inoperative Compressor
  • Leaks
    • A/C - Apparent Leaks At the Heater Core
    • A/C - Refrigerant Loss, Loose or Missing Access Fitting
    • A/C - Refrigerant Loss Prevention
    • Interior - Water Leaks From A/C Evaporator Drain
  • Loose
    • A/C - Refrigerant Loss, Loose or Missing Access Fitting
    • Manual Temp Control Lever - Slips From Hot To Cold
  • Noise
    • A/C - Noise/Vibration When Engaged
    • A/C - Compressor Moan, Vibration or Noise
    • A/C - Moan Diagnosis Procedures
    • A/C - Blower Motor Making Ticking Noise
    • A/C - Blower Motor Ticking Noise
    • A/C - Blower Motor Chirp or Squeak
    • A/C - Moan, Vibration, Noise When Compressor Engaged
    • A/C Compressor - Moan/Vibration/Noise
    • A/C - Pressure Cycling Switch Clicking Noise
  • Odors
    • A/C - Musty Odors Emitted From (HVAC) System
  • Poor performance
    • A/C - Uneven Air Flow At Windshield Defroster Outlet
    • A/C - Reduced Heater Performance
    • A/C - Updated Temperature Control Cables
    • A/C - Noise/Insufficient Cooling/Inoperative Compressor
  • Vibration
    • A/C - Noise/Vibration When Engaged
    • A/C - Moan, Vibration, Noise When Compressor Engaged
    • A/C Compressor - Moan/Vibration/Noise
• 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
  • Tools - A/C Leak Detector Maintenance Kit Availability
    • Overview
    • Service Procedure
  • A/C - Noise/Vibration When Engaged
  • A/C - No LOW or LOW and MEDIUM Blower Speed
  • A/C - Use of Alternate Refrigerants in CFC 12 Units
  • A/C Refrigerant - Contamination
  • A/C - CFC Reduction and Refrigerant Recovery
  • A/C - Erratic HVAC Operation & Self Diagnostic Blinks
  • A/C - Leak Test Diagnosis Tools
  • A/C - Compressor Moan, Vibration or Noise
  • A/C - Compressor Sealing Washer Redesigned
  • A/C - Moan Diagnosis Procedures
  • A/C - System Diagnostic Procedure
    • Overview
    • A.Observe All Safety Precautions:
    • Visual Inspection, Check Charge, Check Electrical & Clutch System
    • E.Check Refrigerant System Performance: Engine Off to Start
    • F.Diagnosis and Service Procedures
  • A/C - Shaft Nut Removal from the HR6HE Compressor
  • A/C Compressor Seal Washer - Reference Chart
  • Intake Air Duct - Reduced Engine Performance
  • A/C - Uneven Air Flow At Windshield Defroster Outlet
  • A/C - Blower Motor Making Ticking Noise
  • A/C - Blower Motor Ticking Noise
  • A/C - Blower Motor Chirp or Squeak
  • A/C - Reduced Heater Performance
  • A/C - Apparent Leaks At the Heater Core
  • A/C - No Low/Medium Blower Speed
  • RWAL Brake Warning Light - False Code 7
    • Overview
    • Service Procedure - S/T Trucks:
    • Service Procedure - C/K Trucks:
    • Service Parts Information
    • Warranty Information
  • A/C - Updated Temperature Control Cables
  • A/C - System Locks In A/C or Heat Mode
  • A/C - Refrigerant Loss, Loose or Missing Access Fitting
  • A/C - Refrigerant Loss Prevention
  • Cooling - New Style Hose Clamp
  • A/C - Moan, Vibration, Noise When Compressor Engaged
  • A/C Compressor - Moan/Vibration/Noise
  • Interior - Water Leaks From A/C Evaporator Drain
  • A/C Control Head - Flashes, Operates Erratically
  • Manual Temp Control Lever - Slips From Hot To Cold
  • A/C - Pressure Cycling Switch Clicking Noise
  • A/C - Use of R-22 Refrigerant Not Recommended
  • 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 System - Heater Case Hot Spot
  • A/C - Noise/Insufficient Cooling/Inoperative Compressor
  • Cooling System, A/C - Aluminum Heater Cores/Radiators