...What would it take to do PWM control on a e-fan?
It seems some mid/late 2000's volvos come with a PWM controller on the fan itself. Can probably find one easily in a junkyard, but here's a new one just as an example.
http://rover.ebay.com/rover/1/711-5...0001&campid=5335821607&icep_item=223053148290
Seems like a pretty simple setup in terms of wiring. Obviously the biggest question is how much current it can handle. I'm running an 95 V6 fan which is single speed only, and i've measured approx 25 amps continuous when running. I forget offhand the starting current but i can measure that.
Quick searching around, i see the Volvo models equipped with the above controller use a 60A fuse for the radiator fan.
Here's the vid
View: https://youtu.be/7y623OihCsU