Blower Motor Inoperative or May Not Shut Off in Extremely Low Ambient Temperature Conditions (Replace Blower Motor Control Module)
| Subject: | Blower Motor Inoperative or May Not Shut Off in Extremely Low Ambient Temperature Conditions (Replace Blower Motor Control Module) |
| Models: | 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) |
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).
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
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 | Qty |
|---|---|---|
89018849 | Module Assembly, Auxiliary Blower Motor Control (Rear System on Escalade ESV, Suburban, Yukon XL) | 1 |
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 |
Warranty Information
For vehicles repaired under warranty, use:
Labor Operation | Description | Labor Time |
|---|---|---|
D0890 | Module, Blower Motor Control - Replace | Use Published Labor Operation Time |
Add | Diagnostic Time |
