One problem related to engine cooling system 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.
The chevy Hhr plugs are corroded and the brakes are defective. The car stalls when hitting over a bump in the road or not while drive at a high speed. No warning light. Stalls 17 times.