Q: For several months my card temp gauge fluctuate while driving, sometimes normal around 190, sometimes it goes higher or lower

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So my temp gauge fluctuates while driving sometimes, usually runs around 190 but will climb to 220 and then will drop down to about 160 then back to normal until yesterday, I was leaving work and the heater would blow ice cold and car started to over heat

My car has 206000 miles.
My car has an automatic transmission.

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