Hello. I've never ran across this problem before. I'm not a mechanic but I can do a lot of things myself. When I idle my engine temperature gauge works fine and my heater blows the right hot or cold air I want. But when I start going down the road my temperature gauge goes to zero and the heater blows barely warm air at best. But if I say stop at a red light, stop and idle at a store etc the gauge goes back to normal and I get hot air again. Don't know what to check first. Thanks
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Saturday, November 9th, 2019 AT 12:37 PM