Blower is crazy

Tiny
BGRAHAM5
  • MEMBER
  • 2006 CHEVROLET TRAILBLAZER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 152,000 MILES
My 2006 chevy Trailblazer's heat/airconditioner is doing what it wants. Some times it doesn't come on when I turn it on, and some times it comes on by itself. If it comes on, the blower continues to run even when the suv is turned off. It will run all night/day until it drains the battery. Please tell me what I should try, or look at.
Thanks
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Sunday, January 23rd, 2011 AT 7:56 PM

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Tiny
MERLIN2021
  • EXPERT
There is a tech bulletin on this, it is as follows:
Blower Motor Inoperative or May Not Shut Off in Extremely Low Ambient
Temperature Conditions (Replace Blower Motor Control Module)
TECHNICAL SERVICE BULLETIN
Reference Number(s): 06-01-39-002C, Date of Issue: January 18, 2008
Related Ref Number(s): 06-01-39-002, 06-01-39-002A, 06-01-39-002B, 06-01-39-002C
ARTICLE BEGINNING
CONDITION
Some customers may comment that the blower motor is inoperative or continues to run after the
vehicle has been shut off.
CAUSE
These conditions may be caused by a blower motor control module failure. This failure may occur
when the vehicle is operated in ambient temperature conditions of -23 C (-10 F) or below.
CORRECTION
Technicians are to replace the blower motor control module, also called the Linear Power Module
(LPM), with the P/N listed below. Refer to either the Blower Motor Control Processor Replacement
or Blower Motor Processor Replacement-Auxiliary procedures in SI. After replacement of the blower
motor control module, the customer may notice a slightly higher than expected blower motor speed at
any of the blower speed settings.
PARTS INFORMATION
Parts Information
Press Ctrl+F to find exact text
Affected
Model(s):
2004-2007 Buick Rainier; 2003-2006 Cadillac Escalade Models; 2003-2006 Chevrolet
Avalanche, Silverado, Suburban, Tahoe; 2003-2007 Chevrolet TrailBlazer Models;
2007 Chevrolet Silverado (Classic); 2003-2006 GMC Sierra Models, Yukon Models;
2003-2007 GMC Envoy Models; 2007 GMC Sierra (Classic); 2003-2004 Oldsmobile
Bravada; 2003-2006 HUMMER H2 Models; with Automatic Temperature Control
HVAC System (RPO CJ2)
Supercedes:
This bulletin is being revised to update the model years that are affected and add the
Oldsmobile Bravada. Please discard Corporate Bulletin Number 06-01-39-002B
(Section 01 - HVAC).
IMPORTANT: Replace the blower motor control module if the vehicle experienced a
blower motor control module failure in extremely cold ambient
temperature conditions.
Part Number
Description
Qty
89018849
Module Assembly, Auxiliary Blower Motor Control (Rear System on
1
WARRANTY INFORMATION
For vehicles repaired under warranty, use:
Warranty Information
Escalade ESV, Suburban, Yukon XL)
89018964
Module, HTR & BLO & A/C CONT (Front system only vehicles -
Except H2)
1
89023355
Module Assembly, Blower Motor Control (H2 Models)
1
89024926
Module Assembly, Auxiliary Heater & A/C Control (Rear System on
Escalade, Yukon, Tahoe)
1
Labor Operation
Description
Labor Time
D0890
Module, Blower Motor Control - Replace
Use Published Labor
Operation Time
Add
Diagnostic Time
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Sunday, January 23rd, 2011 AT 8:00 PM

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