| Subject: | HVAC System Cannot be Controlled or Defaults to Defrost Mode
(Repair HVAC Actuator Harness) |
| Models: | 2003-2005 Cadillac Escalade, Escalade ESV, Escalade EXT |
| 2003-2005 Chevrolet Avalanche, Silverado, Suburban, Tahoe |
| 2003-2005 GMC Sierra, Yukon, Yukon XL |
Condition
| • | Some customers may comment that they cannot control the HVAC (heating,
ventilation and air conditioning) system. Others may comment that the HVAC system
defaults to the Defrost mode. |
| • | Technicians may find that the following diagnostic trouble codes have
set: |
| • | B0229 Recirculation Actuator |
| • | B0414 Left Air Temperature Actuator |
| • | B0424 Right Air Temperature Actuator |
Cause
The HVAC actuator harness may contact a sharp edge on the instrument panel support
brace, causing a rub through condition and a ground out of the actuator control and/or
feedback circuits.
Correction
Locate the HVAC actuator harness contact point shown by the arrow in the above
illustration. The illustration is of the instrument panel with the instrument panel
compartment door opened and folded downward. The actuator harness is located in the
left side of the opening in the instrument panel.
Technicians are to inspect the HVAC actuator harness for contact with the instrument
panel support brace. Repair any damage to the actuator harness wiring and install
protective plastic conduit over the harness. Install friction tape over the sharp
edge of the instrument panel brace. Clear the diagnostic trouble codes and verify
proper HVAC system operation.
Warranty Information
For vehicles repaired under warranty, use:
Labor Operation
| Description
| Labor Time
|
N6642
| Wiring And/Or Connector - HVAC System - Repair Or Replace
| Use applicable labor operation time.
|
