Removal Procedure

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2003 GMC Yukon XL, 2003 GMC Yukon, 2003 Chevrolet Tahoe, 2003 Chevrolet Suburban, and 2003 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.

Remove the third pillar molding. Refer to TRIM REPLACEMENT - THIRD PILLAR (TAHOE / YUKON / ESCALADE / SUBURBAN) or TRIM REPLACEMENT - THIRD PILLAR (AVALANCHE / ESCALADE EXT) in INTERIOR TRIM .
Remove the left rear coat hook, if equipped. Refer to COAT HOOK REPLACEMENT in INTERIOR TRIM
Remove the rear headliner retainers from the front headliner.
Carefully lower the headliner from the roof Velcro retainers.
Disconnect the electrical connector from the inside air temperature sensor.
Partially remove the auxiliary inside air temperature sensor from the headliner.
Remove the sensor grille from the auxiliary inside air temperature sensor.
Remove the auxiliary inside air temperature sensor from the headliner.

Fig 1: Disconnecting Electrical Connector From Inside Air Temperature Sensor
Courtesy of GENERAL MOTORS CORP.

Fig 2: Removing Auxiliary Inside Air Temperature Sensor From Headliner
Courtesy of GENERAL MOTORS CORP.