Enclave FWD V6-3.6L (2008)
Cabin Air Filter: All Technical Service Bulletins
A/C - Gear Oil Type Odor in Interior of Vehicle
TECHNICAL
Bulletin No.: 10-01-37-002
Date: December 09, 2010
Subject: Gear Oil Type Odor in Interior of Vehicle (Install Cabin Filter into HVAC Module)
Models:
2008-2011 Buick Enclave
2009-2011 Chevrolet Traverse
2007-2011 GMC Acadia
2007-2010 Saturn OUTLOOK
Built Prior to October 11, 2010
Condition
Some customers may comment on a gear oil type odor in the interior of the vehicle. The odor may be coming in through the air vents when the HVAC
system is in the non-recirculation mode and can be misdiagnosed as an HVAC concern. The condition is most noticeable when the vehicle is idling at
operating temperature after an extended drive. The odor will typically dissipate when the HVAC system is placed in the recirculation mode.
Cause
This condition may be caused by PTU (transfer case) fluid odor being pulled into the vehicle through the HVAC air inlet due to the location of the PTU
vent.
Correction
To eliminate the odor, install a cabin charcoal filter into the HVAC module using the following procedure.
1. Remove the instrument panel compartment. Refer to the Instrument Panel Compartment Replacement procedure in SI.
2. Cut out the molded access panel on the HVAC module using the appropriate tool.
3. File down any rough edges to ensure a proper fit.
4. Install the filter element into the tray.
