GM Service Manual Online
For 1990-2009 cars only

Removal Procedure


    Object Number: 1242226  Size: SH
  1. Remove the HVAC module. Refer to HVAC Module Assembly Replacement .
  2. Disconnect the lower LH diagnostic test mode (DTM) sensor electrical connector.
  3. Important: Rotate the DTM sensor counterclockwise to disengage the sensor from the lower duct.

  4. Remove the lower LH DTM sensor from the HVAC module.

Installation Procedure


    Object Number: 1242226  Size: SH

    Important: Rotate the DTM sensor clockwise to engage the sensor to the lower duct.

  1. Install the lower LH DTM sensor to the HVAC module.
  2. Connect the lower LH DTM sensor electrical connector.
  3. Install the HVAC module. Refer to HVAC Module Assembly Replacement .