My girlfriend has a 2006 Chrysler PT Cruiser, N/A 2.4, manual trans, 32k miles. It just developed a weird clunking noise. It seems to be coming from the front driver's side. It kind of makes the same sound a flat tire would make. The sound is directly related to vehicle speed (the faster the car goes, the faster it clunks). I was thinking it could be either a CV joint or a hub assembly but I'm not sure. I looked underneath and the CV boots look fine. And it does it when the car is going straight too, not just when turning. Any thoughts?