WARNING: This page is about a different car, the 2010 Pontiac G5 and 2010 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: View Of Blower Motor Resistor Electrical Connector
Courtesy of GENERAL MOTORS CORP.
Disconnect the blower motor resistor electrical connector.
Fig 2: View Of Blower Motor Resistor
Courtesy of GENERAL MOTORS CORP.
Unsnap the blower motor resistor from the HVAC module and remove.