I replaced my belt driven fan in my '95 Chevy S10 4-cylinder with an electric fan from my Geo Metro.
Fan works fine, but like you said, it seems like a fan is never needed anyways. I think a big part of this is that the truck has the same size radiator whether you have the 4 or 6 cylinder.
I have ofter heard that radiators are designed for heat of the bigger engine size when it is towing.
If that's true, than a little S10/Sonoma should never need a radiator fan at all, other than maybe stuck in traffic on a hot day, with your engine idling.
What did you use as a switch to operate your fan turning on and off? Mine has been rigged up to run manually. If you have a specific thermal switch, could you please list the model number or where you got it from?
Thanks,
-Ben
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