Chevrolet HHR owners have reported 1 problem related to engine head gasket failure (under the engine and engine cooling category). The most recently reported issues are listed below. Also please check out the statistics and reliability analysis of Chevrolet HHR based on all problems reported for the HHR.
Never received any warnings that all of the engine cylinders were cracked with the exception of the temperature going into cooling mode one time. Took in for an oil change and asked them to check it out while it was there. Entire engine needed repaired at 50,547 miles. All cylinder sleeves cracked, replaced head gasket, head intake and all seals, gaskets and o-rings.
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