This is what I have !
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 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.
Part Number Description 89018849 Module Assembly, Auxiliary Blower Motor Control (Rear System on Escalade ESV, Suburban, Yukon XL) 1 Qty
Friday, October 3rd, 2008 AT 4:35 AM