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Service bulletins for the 2004 GMC Envoy

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

744 on file from NHTSA, as of 2026-10-19.

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By component

By trouble code

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Only bulletins with component: Heating and air conditioning are shown. Show all

Bulletins, newest first
PIT5099G2023-12-26. Service bulletin. VISIBILITY:DEFROSTER/DEFOGGER/HVAC SYSTEM. This Preliminary Information communication provides information to the technician about vehicles that the Heater-Vent-Air Conditioning blows warm air. Before calling General Motors Technical Assistance Center technician will need to have high and low pressures, outside temperature, humidity, and vent temperature.
PIP5540J2023-01-30. Service bulletin. VISIBILITY:DEFROSTER/DEFOGGER/HVAC SYSTEM:REAR WINDOW:ELECTRICAL HEATING ELEMENT. This Preliminary information communicates to the technician the need to inspect the induction system for potential icing issues in very cold ambient temperatures. To allow the ice to melt so that it can be drained from the related components. That any of the listed DTC's may set with or without poor engine performance.
PIT3033B2022-11-21. Service bulletin. VISIBILITY:DEFROSTER/DEFOGGER/HVAC SYSTEM; ENGINE AND ENGINE COOLING:ENGINE:CRANK/CAMSHAFT POSITION SENSOR. This Preliminary Information communication provides information to the technician that the Cam gear alignment can be incorrect after replacing the HVAC mode actuator.
PIT5099F2022-07-25. Service bulletin. VISIBILITY:DEFROSTER/DEFOGGER/HVAC SYSTEM. This Preliminary Information communication provides information to the technician about vehicles that the Heater-Vent-Air Conditioning blows warm air. Before calling General Motors Technical Assistance Center technician will need to have high and low pressures, outside temperature, humidity, and vent temperature.
PIT5099E2020-08-10. Service bulletin. VISIBILITY:DEFROSTER/DEFOGGER/HVAC SYSTEM. This Preliminary Information communication provides information to the technician about vehicles that the Heater-Vent-Air Conditioning blows warm air. Before calling General Motors Technical Assistance Center technician will need to have high and low pressures, outside temperature, humidity, and vent temperature.
PIT3712A2019-10-15. Service bulletin. EQUIPMENT:APPLIANCE:AIR CONDITIONER. This Preliminary information communicates rear HVAC blower operation and diagnostic.
PIT4204A2019-09-16. Service bulletin. EQUIPMENT:APPLIANCE:AIR CONDITIONER. This Preliminary information communicates the normal operation of the CJ2 automatic HVAC system
PIT5099D2018-11-13. Service bulletin. EQUIPMENT:APPLIANCE:AIR CONDITIONER. This Preliminary Information communication provides information to the technician about vehicles that the Heater-Vent-Air Conditioning blows warm air. Before calling General Motors Technical Assistance Center technician will need to have high and low pressures, outside temperature, humidity, and vent temperature.
PIT5099C2018-08-06. Service bulletin. EQUIPMENT:APPLIANCE:AIR CONDITIONER. This Preliminary Information communication provides information to the technician about vehicles that the Heater-Vent-Air Conditioning blows warm air. Before calling General Motors Technical Assistance Center technician will need to have high and low pressures, outside temperature, humidity, and vent temperature.
PIT5099A2018-05-07. Service bulletin. EQUIPMENT:APPLIANCE:AIR CONDITIONER. This Preliminary Information communication provides information to the technician about vehicles that the Heater-Vent-Air Conditioning blows warm air. Before calling General Motors Technical Assistance Center technician will need to have high and low pressures, outside temperature, humidity, and vent temperature.
030848006J2017-12-22. Service bulletin. VISIBILITY:DEFROSTER/DEFOGGER/HVAC SYSTEM. This informational bulletin provide information for the technicians to repair the rear window defroster contact or tabs.
PIT-51412012-04-10. Service bulletin. EQUIPMENT:APPLIANCE:AIR CONDITIONER. BUICK/CADILLAC/CHEVROLET/GMC/OLDSMOBILE: IF BLOWER MOTOR IS SET TO ANY SPEED POSITION AND WHEN KEY IS OFF, IT BECOMES INOPERATIVE AND MAY STILL BE INOPERATIVE AFTER KEY IS TURNED ON. *PE UPDATED ON 5/1/12. *JS
37662006-01-06. Service bulletin. VISIBILITY:DEFROSTER/DEFOGGER/HVAC SYSTEM:FAN/MOTOR. FRONT BLOWER INOPERATIVE STAY RUNNING DURING LOW AMBIENT TEMPERATURE. *TT
0501380122005-11-04. Service bulletin. EQUIPMENT:APPLIANCE:AIR CONDITIONER. EI05082 - LOSS OF BLOWER MOTOR SPEEDS EXCEPT FOR HIGH SPEED OR INOPERATIVE. *TT UPDATED. *KB UPDATED *KB
36562005-10-20. Service bulletin. VISIBILITY:DEFROSTER/DEFOGGER/HVAC SYSTEM:FAN/MOTOR. REPEAT REAR BLOWER MOTOR FAILURE OR INOPERATIVE. *TT UPDATED 12/5/08. *PE UPDATED 08/06/2012 *JS
021220042005-04-06. Service bulletin. EQUIPMENT:APPLIANCE:AIR CONDITIONER. INADEQUATE HVAC FOR PASSENGERS SEATED IN THE SECOND AND THIRD ROW. *TT
040139006A2005-02-17. Service bulletin. EQUIPMENT:APPLIANCE:AIR CONDITIONER. NOISE AND OR VIBRATION WHEN A/C COMPRESSOR CYCLES. *EH UPDATED *EH
0401390092005-01-10. Service bulletin. VISIBILITY:DEFROSTER/DEFOGGER/HVAC SYSTEM:FAN/MOTOR. HVAC BLOWER MOTOR INOPERATIVE OR STAYS RUNNING. *TT
31792004-11-08. Service bulletin. EQUIPMENT:APPLIANCE:AIR CONDITIONER. AUTOMATIC DUAL ZONE HVAC BATTERY DRAW SUPPLEMENT TO 02-01-39-007A. *TT
31042004-11-05. Service bulletin. EQUIPMENT:APPLIANCE:AIR CONDITIONER. ONLY REPLACEMENT OF EVAPORATOR CORE OR PIPES FOR REAR HVAC. (TO INCLUDE 2005 CHEVROLET TRAILBLAZER) *SC
31522004-11-03. Service bulletin. EQUIPMENT:APPLIANCE:AIR CONDITIONER. BLOWER SPEED CHANGES ON ITS OWN. *TC UPDATE. *TT
30762004-10-08. Service bulletin. EQUIPMENT:APPLIANCE:AIR CONDITIONER. REPEAT HVAC BLOWER MOTOR FAILURE. *TT
15310182004-08-23. Service bulletin. EQUIPMENT:APPLIANCE:AIR CONDITIONER. HVAC MODE ACTUATOR CAM GEAR ALIGNMENT IS INCORRECT AFTER REPLACEMENT. *MJ
0401380052004-08-12. Service bulletin. EQUIPMENT:APPLIANCE:AIR CONDITIONER. HVAC CONTROL MODULE MEMORY FUNCTIONS - ELIMINATION OF CLIMATE CONTROL PERSONALIZATION FEATURE. *TT
016562004-06-03. Service bulletin. VISIBILITY:DEFROSTER/DEFOGGER/HVAC SYSTEM:REAR WINDOW. ENDGATE GLASS DEFOGGER PERFORMANCE.*MR

The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.