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Enging Temp Gauge and Cabin Heating

Recently (the last three days) my car’s engine temp gauge has been going to H when I try to blow hot air into my car. Meanwhile the air is not hot. Once, I turn the air to cold, the engine temp arrow drops back down to normal almost immediately. This doesn’t seem to be a consistent thing, because when I took it to the mechanics, everything was fine. I am hoping somebody has an idea because I don’t want to take it back to the mechanics without a suggestion…they will find nothing wrong and I’ll just owe more money.



Thanks!