WARNING: This page is about a different car, the 2007 GMC Sierra and 2007 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: View Of A/C High Pressure Recirculation Switch
Courtesy of GENERAL MOTORS CORP.
Disconnect the electrical connector from the A/C high pressure recirculation switch.
Remove the A/C high pressure recirculation switch (1) from the condenser tube.