I know I do! Fucker has been behaving awesome in the new job, have had to take a few road trips including present delivery, holy crap can that little booger hold a lot of storage
On a side note, as a noob ass driver I dont know a lot of things, when I'm going fast on the highway the car sounds weird, almost like a window is open/air is coming in, so I mentioned it to my husband who just chuckled and said "hun you dont have a car, you have an HHR, it sounds like that because it has the aerodynamics of a carton of milk"
Check your door hinges. I can't remember if gm used them in the hhr but it's pretty common for the brass bushings to wear out on gms and will cause what you're describing.