NHTSA ID Number: 10226383
Manufacturer Communication Number: PIT3033B
Summary
This Preliminary Information communication provides information to the technician that the Cam gear alignment can be incorrect after replacing the HVAC mode actuator.
Condition / Concern
Cam gear alignment is incorrect after replacing the HVAC mode actuator.
Recommendations / Instructions
Remove white cam gear and silver shaft as a assembly from the mode actuator. With the actuator removed from the case, place the actuator across a opened vise with the white gear facing down. Use a socket (the same size as the actuator shaft) to tap the shaft out with the white gear attached.
Once this shaft is separated from the actuator, align the black gear on the HVAC case with an alignment tab and mesh it with the slot on the white gear. Once the white gear is installed to the black gear on the HVAC case, the mode actuator can then be re- attached to the actuator. This can be pressed together by hand. Once installed, re-secure the actuator back to the HVAC case. Finally re-calibrate the actuators using the Tech2.
31 Affected Products
Vehicles
| MAKE | MODEL | YEAR |
| BUICK | RAINIER | 2004-2007 |
| CHEVROLET | TRAILBLAZER | 2003-2009 |
| CHEVROLET | TRAILBLAZER EXT | 2003-2004, 2006 |
| CHEVROLET | TRAILBLAZER EXT 370 | 2005 |
| GMC | ENVOY | 2002-2009 |
| GMC | ENVOY XL | 2002-2004, 2006 |
| GMC | ENVOY XL 370 | 2005 |
| GMC | ENVOY XUV | 2003-2005 |
1 Associated Document
Manufacturer Communications
Bulletin No.: PIT3033B
Published date: 10/18/2022
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SEOCONTENT-START
Bulletin No.: PIT3033B Published date: 10/18/2022 Preliminary Information PIT3033B HVAC Mode Actuator Cam Gear Alignment is Incorrect After Replacement Models Brand: Buick Rainier Model: Model Years: 2004 – 2008 VIN: from to All All Engine: All All Transmissions: Chevrolet Chevrolet GMC GMC GMC GMC GMC Trailblazer Trailblazer EXT Envoy Envoy XL Envoy Envoy XL Envoy EXV 2003 – 2009 2003 – 2009 2003 – 2009 2003 – 2009 2002 – 2009 2002 – 2009 2003 – 2009 All All All All All All All All All All All All All All All All All All All All All All All All All All All All Supersession Statement This PI has been revised to update the model years. Please discard PIT3033. The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI. Condition / Concern Cam gear alignment is incorrect after replacing the HVAC mode actuator. Recommendations / Instructions Remove white cam gear and silver shaft as a assembly from the mode actuator. With the actuator removed from the case, place the actuator across a opened vise with the white gear facing down. Use a socket (the same size as the actuator shaft) to tap the shaft out with the white gear attached. Once this shaft is separated from the actuator, align the black gear on the HVAC case with an alignment tab and mesh it with the slot on the white gear. Once the white gear is installed to the black gear on the HVAC case, the mode actuator can then be re- attached to the actuator. This can be pressed together by hand. Once installed, re-secure the actuator back to the HVAC case. Finally re-calibrate the actuators using the Tech2. 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. © 2022 General Motors
. All Rights Reserved.
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