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Water Temp Changes

I know there are a lot of posts re the right thermostats, but I don't know if this is thermostat related.

I never had cooling problems and since installing a new Fluidyne the temps are even lower than before.

Recently I noticed that while cruising on the highway, at a consistent speed, the temp gauge will suddenly climb up from 180 to 200 and then fall back down to 180 all within a few minutes, with no change in speed or conditions.

Any ideas?
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