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It's sounding more like the heater system then the cooling system itself, unless you mean really drastic changes in the engine temp display. Almost like you are really scrutinizing the engine temp. I would disconnect the monovalve connector and see if it goes to ful heat once the engine warms up and report back, if the heater temp is still going up and down after that I would almost have to think it's the monovalve itself,unless others have ideas. But as a test, i would say next step is now to disconnect the monovalve electrically and report back.
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