Clunk noise in my 2007 Chevrolet HHR or Pontiac G6.
I have a clunk noise in the front end of my HHR. It happens when i am  turning the  wheel, and also when going over bumps in the road. Most of the time it is when going  over a set of rail road tracks.
I had the steering and struts checked at a local shop, but  they said they did not see anything. Is there a common problem with these cars?
Common cause of of clunk noise in the front end of my 2007, 2008, 2009 Chevrolet HHR when going over bumps or turning while driving. This also may be the problem for the Cobalt, Pontiac G6 and similar models.
Answer:
By what you are describing, this sounds like a common problem on the HHR, Cobalt,  Pontiac G6 and other models 2008 and 2009, with a 'Front stabilizer bar link / arm, or the a
lower control arm bushing. There is one on  each wheel. It connects the lower control arm to the  front stabilizer bar. The bar helps  control body roll when turning. There is a ball socket  joint on the top and bottom of the  arm. (See pic below).  
With the year and mileage, this noise condition would be under the factory warranty,  even if this is not  the problem.
Question: I have a G6 and my husband drives a HHR. I had a "popping" noise in my G6 last year whenever I would turn the wheel, and it ended up being a lube kit (service bulletin is available for this part and should be covered by GM service shops). My husband has clunking in his HHR when he drives over bumps, railroad tracks, etc and we've been told it's quite possibly the wheel bearing.
Answer:
Most likely it is not a wheel bearing causing a clunking noise over bumps. If the wheel bearing is bad, it usually makes a growling noise that gets louder the faster you drive. If it is bad enough to cause a clunk, you would have heard it making noise for a long time before that. The most probable parts making noise over bumps are the front sway bar end links, or lower
control arm bushings. More often than not, both of these are bad together and need replaced. If you can get the car in the air, you can check play in the sway bar end links, and look to see if the front lower control arms are down against the subframe at the rear attaching point. Replace in pairs is advisable for either part.
Chevy HHR, Pontiac G6 Clunk In The Front End

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