Truck Heater Not Working Properly?

Why is my heater turning on with the truck powered down? Also, when you drive, it turns off and on when it wants to. Only high speed works.

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Judy
Gold Post Medal for All Time! 677 Posts

January 22, 20170 found this helpful

If it works sporadically, you may have a thermostat problem.

Leware T.

January 22, 20170 found this helpful

It sounds like a short. You might need a mechanic to check it out.

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