Well there are a couple of things that come to mind right off the bat....

1. Warped brake rotors caused by the rear brakes being out of adjustment, the "self adjusters" on the HHR's rear drums seldom work and they should be adjusted manually at every oil change or 5,000 miles/8,000km.

2. Sway bar end links, they'll usually make a clunking over low speed bumps, especially noticeable in parking lots.

3. Sway bar bushings, see #2 above, they'll complain at low speeds.

4. Intermediate shaft in the steering column, they were/still are an issue especially on the '06 model year.

Pop these into the "Search" function in the toolbar at the top of the page, lots of threads to read, and lots of info on the fixes.

 

Ya its the dealership...They dident say anything about a recall to me the first time i broght it in..But recall or not they should still fix the problem...They said they dident detect one when they took it for a spin but i told them it only happens in certain conditions..They better fix it this time..They charged me last time for labour because they dident find anything that was coverd under my waranty..