[Formulajones]

Originally Posted by Sirrotica

The idea has been thrown out there that the car manufacturers changed over for fuel mileage reasons, but until engines were mounted transversely in a chassis, very, very few cars had electric fans. Obviously there is no way a mechanical fan can be driven by the conventional transverse mounted engine so enter the electric fans.....

Just for interesting conversation, your heavier 3/4 ton and up and even some of your 1/2 ton trucks today still don't use electric fans. Seems the vehicles that are destined and designed as a work horse for towing and hauling, still use big ole' mechanical clutch fans and shrouds. That says something.

My Duramax has a mechanical clutch fan on it, and my fathers newer 3/4 ton gas engine also has a mechanical clutch fan. My Duramax also has a factory 180 temp primary thermostat and the secondary is a 185.