Thermostat question

TrailBeast said

That tends to make one think that if you ran your engine 10% slower then it could overheat, but it doesn't.
There is other issue's going here.

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Uh, no. With underdriven pulleys the accessories turn slower for a given RPM. If you slow the engine down, you also slow down the production of heat. It's the relationship between the engine speed and the water pump speed that's important.