I had my heater going this morning cause it was a bit cold. As I'm driving to work, I see my temp guage going up about a hair under dead, so I pulled over and shut the car off. I got fluid, and the fan works. I turned the car back on, and the needle was back at normal, but kept going up 3/4 ways and dropping, back and forth. I shut off the heat in the car, and the needle went back to normal and stayed there. ??? Any idea?

Thanks.

 

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