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Service bulletin 3766

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.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id10018566
Published by NHTSA2006-01-06
Manufacturer's number3766
NHTSA componentVISIBILITY:DEFROSTER/DEFOGGER/HVAC SYSTEM:FAN/MOTOR

NHTSA's summary

FRONT BLOWER INOPERATIVE STAY RUNNING DURING LOW AMBIENT TEMPERATURE. *TT

The document

No address for NHTSA's copy can be built for this communication. Ask the dealer for it by the manufacturer's number.

Components

Glass, wipers and mirrors, Heating and air conditioning

Vehicles listed
CHEVROLET AVALANCHE2004, 2005, 2006
CHEVROLET SILVERADO2004, 2005, 2006
CHEVROLET SUBURBAN2004, 2005, 2006
CHEVROLET TAHOE2004, 2005, 2006
CHEVROLET TRAILBLAZER2003, 2004, 2005, 2006
GMC ENVOY2003, 2004, 2005, 2006
GMC SIERRA2004, 2005, 2006
GMC YUKON2004, 2005, 2006

Listing a model year does not mean every vehicle of it is concerned: the document says which.

Recalls for the same vehicles and component
15V5990002015-09-24. VISIBILITY:POWER WINDOW DEVICES AND CONTROLS
14V4040002014-07-02. VISIBILITY:POWER WINDOW DEVICES AND CONTROLS
13V2480002013-06-13. VISIBILITY:POWER WINDOW DEVICES AND CONTROLS; ELECTRICAL SYSTEM
12V4060002012-08-16. VISIBILITY:POWER WINDOW DEVICES AND CONTROLS; ELECTRICAL SYSTEM
20110742011-02-21. Heater And Defroster
05V0350002005-02-03. VISIBILITY:WINDSHIELD
04V0460002004-02-04. VISIBILITY:WINDSHIELD WIPER/WASHER

A recall listed here may apply to some of the same vehicles. Only the manufacturer can say whether it applies to one vehicle.

Other bulletins for the same vehicles and component
PIT5099G2023-12-26. Service bulletin. 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.
PIT5099A2023-12-11. Service bulletin. A/C Blows Warm Or Poor Performance.
PIP5540J2023-01-30. Service bulletin. 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. This Preliminary Information communication provides information to the technician that the Cam gear alignment can be incorrect after replacing the HVAC mode actuator.
PIC5260F2022-07-25. Service bulletin. This Preliminary Information communication advises the technician the steps on diagnosing the concern. Customer's sunroof operation intermittent, bind, noise, auto-reverse, and/or water leaks.
PIT5099F2022-07-25. Service bulletin. 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.
PIC5260E2022-05-16. Service bulletin. This Preliminary Information communication advises the technician the steps on diagnosing the concern. Customer's sunroof operation intermittent, bind, noise, auto-reverse, and/or water leaks.
PIC5260D2021-04-19. Service bulletin. This Preliminary Information communication advises the technician the steps on diagnosing the concern. Customer's sunroof operation intermittent, bind, noise, auto-reverse, and/or water leaks.
PIT5099E2020-08-10. Service bulletin. 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. This Preliminary information communicates rear HVAC blower operation and diagnostic.