One problem related to clutch has been reported for the 2007 Chevrolet HHR. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2007 Chevrolet HHR based on all problems reported for the 2007 HHR.
My clutch went out and the car stopped working gas I was driving along the highway. It was not during a shift, just acceleration. The clutch did the exact same thing on December 23, 2013 (mileage about 115,000). I have driven manual transmissions previously and have gone well over 100k miles without replacing the clutch and I am now on my 3rd clutch. I know there is a TSB on a possible bad flywheel (which was not replaced either time), but a clutch to go out twice on a car that has seen for the last 55k almost all highway miles indicates there is a problem with the car.