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I recently encountered a strange heating problem with my Volt. I like to start in electric (Normal) mode, switch over to gas (Hold mode) when I hit the four lane highway after about 25 minutes, and then back to electric when I get off the highway twenty minutes after that. As soon as I drop back into Normal mode, the heater quits, and it starts blowing cold (outside temperature) air at me. It doesn't matter what I do with the buttons or the temperature control, it just quits heating. It even persists if I stop and turn the car right off and then back on again. After about twenty minutes of continued driving it suddenly starts to heat again.

Has anyone else run into this problem?
 

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What year?
What is your climate control set to?

What you're reporting would be the expected result if the car was set to fan only, but we've also seen some cars with failed electric heaters and some others with control modules that needed updating.
 

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The model year is 2017, made mid-April 2016.

Climate control is normally set to Max, 23 degrees C, with Auto off (because the windshield fogs way too easily in Auto). But I've tried it in Eco mode, and with the temperature set to 26, HI, and I always the same symptoms. Switch the Hold mode off, and within a few seconds the cold air appears, at which point fussing with the fan, switching to Auto, Eco, Max, and twiddling the temperature knob does nothing at all.

The heater works - both electric and gas. It just stops working, then eventually decides to start up again all by itself. It does it every time I drive this particular route drop out of Hold mode, so I think it must be a software issue.
 

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set to Max, 23 degrees C, But I've tried it in Eco mode, and with the temperature set to 26, HI, and I always the same symptoms.
there is your problem. Try heat at full comfort mode with the highest temp setting. If that doesn't work dealership visit is in order.
 
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