[MaSnaka]

Not so silly. Originally the fan was only controlled by the dash switch. Which is fine until you wonder what that smell is and realize your coolant is overly hot and your late in turning the fan on. I hooked up an auto fan switch that starts the fan whenever the water temp gets above 195f. I had the switch availible and the option to maintain the manual switch so I kept it. I can do it both ways (auto and manual)and I guess it boils (pun intended) down to peace of mind if the temps get ugly, I can still turn on the fan if the auto switch fails. The auto switch I bought had a lead that would start the fan if an AC was turned on and I wired that to a dash light that indicats when in fact the fan is running. It's nice to be able to confirm when the fan is running.

John