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I'm sorry that you "have" to disagree, ;) , but I'm pretty sure that an automotive thermostat opens and closes gradually. Check out this wikipedia article (the part about Wax Pellet thermostats): Thermostat - Wikipedia, the free encyclopedia I will copy the pertinent paragraphs for those of...

I'm sorry, but I still have some doubts. A thermostat is not an on/off device, it opens and closes progressively. Thus, water temperature should be practically constant once it reaches operating temp (i.e. thermostat starts to open), except when the thermostat is fully open and the cooling...

The described behaviour is "normal" in the sense that it happens to all of us FZ6 users, but it certainly doesn't SEEM normal when compared to the theory of the cooling system (water/radiator/pump/thermostat/fan) or to the practice of cars. In cars with their cooling systems in good shape...