Rear HVAC Temperature/Mode Inoperative With DTC B0429 Or B3531 - keywords actuator bind control cold door head heat hot motor move no stick stuck valve warp wire
| Subject: | Rear HVAC Temperature/Mode Inoperative With DTC B0409 Or B3531 |
| Models: | 2003-2006 Cadillac Escalade, Escalade ESV |
| 2003-2006 Chevrolet Suburban, Tahoe |
| 2003-2006 GMC Yukon, Yukon Denali, Yukon XL, Yukon Denali XL |
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Condition/Concern:
Owners may comment that the rear HVAC temperature or mode door will not operate. When checking for DTCs a B0429 or B3531 will be present in the "Rear Aux. Climate Module". This DTC will set if the mode or temperature door is stuck
Recommendation/Instructions:
Remove the effected actuator and manually check the effected door for binding or being stuck. If the door is binding of stuck, the only repair is to replace the affected door
Note: On short wheel base utilities (Escalade, Yukon, Tahoe) the temp/mode doors are only available as part of the upper HVAC case. In most cases, the part number for the upper HVAC case is 88891577, but have your parts department verify this for your application.
Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.
