No electric fan. Just a 3 blade clutch fan from a 350 pickup truck. This is all factory. The wire from the harness runs to a single terminal sender on the water neck with 2 wires connected to the plug. The other wire that is connected to the first plug goes to the sender in the head. That way if either sender gets hot and grounds the hot light comes on. I even looked up the wiring diagram at Steve's Nova Site and it shows one temp sender on V8 models and 2 temp senders used on 6 cylinder cars. The senders look simular but I don't know if they are the same or not. Maybe one comes on at a higher temp than the other one? I wonder why would the factory do this? Jay
