Quote:
Originally Posted by andrewwynn
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The viscous clutch is warmed from the coolant in the water pump.
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Yeah, I thought that too, Andrew - until I had a viscous clutch fail on me and I looked into it more. Turns out they operate mostly from radiator airflow - the radiator heat causes changes in a small spring at the front of the viscous clutch. Very little heat from the water pump reaches this actuator spring.
Have a watch of this - I watched it and learnt a lot!
https://youtu.be/UwM4OqsLek4