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Yeah you’re right. There’s some centrifugal clutch mechanism that disengages after a certain RPM. The fan is indeed always on, but stays at a lower rpm. Thx!

Cool. I didn’t see a temperature sensor anywhere. How does the clutch know when to engage/disengage?

This is just a mechanical fan attached to the pulley and driven by the serpentine belt. Not electric. I don’t think it has any type of clutch though because it is always running.

Hi all! My name is JJ, and I'm new to the forum. I have a 2000 Mazda B2500. The truck runs cool. Temp guage will slowly make its way up to operating temperature, but if I drive on the highway the increased airflow will cool it back down and the gauge goes back down to "C". I noticed that the...