Suburban 3/4 Ton 4WD V8-6.0L VIN U (2004)
Blower Motor Relay: Customer Interest
A/C - Blower Motor Runs After Vehicle Is Shut OFF
TECHNICAL
Bulletin No.: 03-01-38-015A
Date: October 27, 2008
Subject:
HVAC Blower Motor May Run Continuously After Vehicle is Turned Off (Replace Blower Resistor Relay)
Models:
2004 Chevrolet Avalanche, Silverado, Suburban, Tahoe, TrailBlazer, TrailBlazer EXT
2004 GMC Envoy, Envoy XL, Sierra, Yukon, Yukon XL
with Manual Control HVAC (RPO CJ3)
Built Prior to August, 2003
Supercede:
This bulletin is being revised to update the parts information. Please discard Corporate Bulletin Number 03-01-38-015 (Section 01 - HVAC).
Condition
Some customers may comment on the HVAC blower motor running after the vehicle has been turned off. The blower may run for just a few minutes or
continuously until the battery is discharged.
Cause
A new style HVAC blower relay/resistor may stick in the "on" position. When the HVAC fan blower relay has been energized, the contacts may
"micro-weld" together. After this occurrence, the HVAC blower may not respond to the HVAC controller commands.
Correction
Replace the HVAC blower resistor/relay with the type used previous to the 2004 model year. The appropriate part numbers are listed in the table below.
For specific repair procedures, refer to the 2004 Service Information (SI) under Blower Motor Resistor Assembly Replacement (SI Document ID #
526350 (C/K) or # 729996 (S/T).
Parts Information
Warranty Information
Disclaimer
