2007 Chevrolet HHR Repair Question
No Blower High Speed
probably the switch itself. it connects different degrees of grounding to the blower. take center panel apart(trim just pops off/out unscrew plate with switch) and unplug blower switch. connect black and orange wires with jumper. this is HIGH connection to blower. if it works its the switch.
here's a couple pics
if ya need a switch try ebay or salvage yard.