I did the reset this afternoon and it seems to have fixed it. I will drive it for a few days and let you know if the problem persists. Thanks everyone for the advice!

 

I was driving last night and it started acting up again. I had the defrost on and all the sudden air started coming out of the front dash and the selector knob was unresponsive.

Since the reset seemed to go through all the vents I think the motors might all be ok. Maybe it's an issue with the climate control panel?

I also just changed the cabin air filter right after I bought the car. Is there anything I could have messed up while replacing that?

 

Only if you didn't put the filter in the slot or stuck something in the hole.
The control panel is very easy to replace. stick your fingers in the vents and yank to remove the "waterfall" then 2 screws and the electrical connector.

Removing a stock radio - Chevy HHR Network

 

Thanks! I'll try pulling the control panel and see if I can find anything wrong with it.

 

It sounds like the control module is having issues. Need a factory level scan tool to see what is going on.

 

Thanks! I can pull one from the junkyard and give it a try. Do you know if they have to be programmed to the vehicle?

 

I’ve only replaced one, it was plug and play.