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Q: My temperature gauge rises then goes back down.

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While I am driving for a while my truck is at the right temp but the more I drive the more the temp gauge increases bit it stops at the line in the middle of 210 and 260 and doesn't go no higher the it drops slowly back down to normal which is about 209 and it's fine the rest of the drive until the next time I cut it off and wait a little bit the crank it and go again. Is that my thermostat getting stuck?

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