Heating and Air Conditioning: Technical Service Bulletins

• Recalls
  • Campaign - Reroute The Heater Outlet Hose Assembly
    • Overview
    • Owner Notification, Dealer Resposibility, Part Information
    • Service Procedure
    • Campaign Identification Label
    • Owner Letter
• Customer Interest
  • Body - Broken Rear Window Defogger Grid Detection
  • A/C - Musty Odors Emitted From (HVAC) System
  • A/C - Extreme Temperature Difference in BI-Level Mode
  • A/C - Clicking/Thumping Noise During Operation
  • A/C Drain Hose - Drips Into Passenger Area
  • A/C Compressor - Rattling on Startup With System On
  • A/C - Inoperative, Code 09 (Low Freon)
  • HVAC Blower Motor - Whine
  • A/C - Reduced Performance
  • A/C - Inadequate Heat/Air Flow to Driver's Side Floor
  • A/C - Inadequate Windshield Defroster
• By Symptom
  • Customer Interest
    • Body - Broken Rear Window Defogger Grid Detection
    • A/C - Musty Odors Emitted From (HVAC) System
    • A/C - Extreme Temperature Difference in BI-Level Mode
    • A/C - Clicking/Thumping Noise During Operation
    • A/C Drain Hose - Drips Into Passenger Area
    • A/C Compressor - Rattling on Startup With System On
    • A/C - Inoperative, Code 09 (Low Freon)
    • HVAC Blower Motor - Whine
    • A/C - Reduced Performance
    • A/C - Inadequate Heat/Air Flow to Driver's Side Floor
    • A/C - Inadequate Windshield Defroster
  • Leaks
    • A/C - Leak Test
    • A/C Drain Hose - Drips Into Passenger Area
  • Noise
    • A/C - Clicking/Thumping Noise During Operation
    • A/C Compressor - Rattling on Startup With System On
    • HVAC Blower Motor - Whine
  • Odors
    • A/C - Musty Odors Emitted From (HVAC) System
  • Poor performance
    • A/C - Extreme Temperature Difference in BI-Level Mode
    • A/C Compressor - Rattling on Startup With System On
    • A/C - Reduced Performance
    • A/C - Inadequate Heat/Air Flow to Driver's Side Floor
    • A/C - Inadequate Windshield Defroster
  • Recalls
    • Campaign - Reroute The Heater Outlet Hose Assembly
      • Overview
      • Owner Notification, Dealer Resposibility, Part Information
      • Service Procedure
      • Campaign Identification Label
      • Owner Letter
• 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
  • P/S - Revised Pressure Switch Wiring Diagram
  • 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 - Extreme Temperature Difference in BI-Level Mode
  • A/C Refrigerant - Contamination
  • A/C - Clicking/Thumping Noise During Operation
  • A/C - R134A Refrigerant Information
  • A/C - Revised Wiring Diagrams & Diagnostics
    • Overview
    • Air Delivery and Temperature Control
    • Vacuum Control
    • 24-Way Control Head Connector ID
    • 6-Way Solenoid Module/Air MIX Door Connector ID
    • Component Location
    • Splice Location
    • Troubleshooting Hints
    • System Diagnosis
    • System Check
    • Chart 1 - Airflow From Outlets Incorrect
    • Vacuum Diagnosis
    • Chart 2 - Airflow Does Not Change
    • Circuit Operation (Air Delivery)
    • Circuit Operation
  • A/C - Leak Test
  • A/C Drain Hose - Drips Into Passenger Area
  • A/C Compressor - Rattling on Startup With System On
  • A/C - New Compressor Sealing Washer
  • A/C Compressor Shaft Nut - Removal (Discontinued)
  • A/C Compressor Seal Washer - Reference Chart
  • A/C - Inoperative, Code 09 (Low Freon)
  • HVAC Blower Motor - Whine
  • A/C - Reduced Performance
  • Campaign - Reroute The Heater Outlet Hose Assembly
    • Overview
    • Owner Notification, Dealer Resposibility, Part Information
    • Service Procedure
    • Campaign Identification Label
    • Owner Letter
  • 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 - Information On the Use of Alternate Refrigerants
  • A/C - Inadequate Heat/Air Flow to Driver's Side Floor
  • A/C - Inadequate Windshield Defroster
  • Cooling System, A/C - Aluminum Heater Cores/Radiators