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I have the same problem when driving in a open highway with a good gus of wind. I think it has to do with the wind ramming into the radiator and in the engine compartment cooling the entire block.
My temp does not go below 160 ( or the road is not long enough) and as soon as I hit a closed area temp rises.
My T-stat is installed correctly and it is a 180 degree. Thi sonly happens to me during the the cooler seasons.
I think you are fine.
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