One problem related to engine cooling system has been reported for the 2006 Chevrolet HHR. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2006 Chevrolet HHR based on all problems reported for the 2006 HHR.
I was driving and the temperature indicator light came on, the alarm sounded and suddenly the temperature is at over 250. I turned on the fan and heat and managed to slowly make it 1/2 miles home. Next day I drove 2 blocks into the repair shop and there was not one drop of coolant in the car. Apparently the radiator is completely exposed to rocks and other debris in the roadway. I don't recall hitting anything but there is road construction everywhere. This is a dangerous and expensive design flaw. I am still waiting for the ultimate "damage" report but intend to file this complaint, complain to Chevrolet and also let my insurance company know and see if I can recover the costs if this means a new radiator and condenser. I have seen this same complaint on all Hhr 2006 and newer models as well. It should be a recall and repair issue.