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I have a question. This morning my check engine light came on and after a 20 minute drive my heat gauage was still at 0. I had plenty of heat in the vehicle. Engine sounded normal. This is a 06 hhr with 50k 2.4 ltr. Any ideas. Thanks

Take the car to the dealer

You could also take the vehicle to some place that can check the codes for free, such as Autozone. Then you will know beforehand what the problem may be and if it is covered under warranty ,(if there is still a warranty in place.)

Haven't heard of it happening on an HHR before, but on another GM vehicle the CE light can come on if you have a stuck open thermostat.