Why doesn't the heater get hot and the temperature gauge is on hot? on 1998 Toyota Tacoma

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I noticed that my heater was blowing cool air snd then the needle for the temperature went up to hot. When I turned off the heater the temperature went down some.
(1) Answer
(2) Comments
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Sounds like a grounding issue; Check and clean all your grounds before going further, and coolant level.
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