Q: needle on temp gage keeps raising

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Just recently had my radiator replaced but the temp gage will go up to h and then drop back down to the half way point on the temp gage. There are no antifreeze leaks, and engine coolant light does not come on. However, there is a smell of antifreeze when the AC or heater when turned on.

My car has 191000 miles.
My car has an automatic transmission.

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