Rear HVAC System May Come On Unexpectedly - keywords a/c ac blower control heat heater intermittent unwanted
| Subject: | Rear HVAC System May Come On Unexpectedly |
| Models: | 2008 Buick Enclave RPO CJ2 without UK6 |
| 2007-2008 GMC Acadia RPO CJ2 or C67 without UK6 |
| 2007-2008 Saturn Outlook RPO CJ2 or C67 without UK6 |
This PI was superseded to update the fix information. Please discard PIT4335B.
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Condition/Concern:
The Rear HVAC system may come on unexpectedly. This condition may occur on vehicles with either a Front Manual or Front Automatic HVAC controlled system combined with a Rear Manual HVAC control (non-RSA). This concern is most likely to occur when the Rear HVAC control knobs are placed "in-between detents".
Recommendation/Instructions:
Reprogram the HVAC control module with the latest calibration in TIS.
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.
