2005 GMC Sierra fan control not working properly

  • 2005 GMC SIERRA

Air Conditioning problem
2005 GMC Sierra V8 Four Wheel Drive Automatic 70000 miles

one day the a/c fan kept blowing after I turned off the truck. Then it worked fine. The next day it was delayed several minutes before it started blowing. Now sometimes it blows and sometimes it doenst. The air is cold and I feel it if I drive fast and the read out controls work fine. Its an slt digital dual climate display. My brother has the same problem with his 01 sle suburban non digital display. Its like the blower control is fried and it doesnt know when to work properly. Is there a history of this and how do I fix it?

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Wednesday, October 1st, 2008 AT 7:36 PM

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This is what I have !

Blower Motor Inoperative or May Not Shut Off in Extremely Low Ambient Temperature Conditions (Replace Blower Motor Control Module)
Reference Number(s): 06-01-39-002C, Date of Issue: January 18, 2008 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) Affected Model(s):
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).
Related Ref Number(s): 06-01-39-002, 06-01-39-002A, 06-01-39-002B, 06-01-39-002C
Some customers may comment that the blower motor is inoperative or continues to run after the vehicle has been shut off.
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.
IMPORTANT: Replace the blower motor control module if the vehicle experienced a blower motor control module failure in extremely cold ambient temperature conditions.
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
Part Number Description 89018849 Module Assembly, Auxiliary Blower Motor Control (Rear System on Escalade ESV, Suburban, Yukon XL) 1 Qty

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Friday, October 3rd, 2008 AT 4:35 AM

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