Fan clutch

1965 was the first year for factory AC which included the following cooling system upgrades.

The condenser is in front of the radiator. Because of the added load the condenser imposes on the engine cooling system, Darts equipped with air conditioning have special cooling system components. Included are a larger radiator, a higher capacity fan with box-type shroud and a 16 psi (instead of 14 psi) radiator pressure cap.

Models with V-8 engine, unless they are equipped with a trailer-towing package, have a viscous drive fan with thermal control instead of the solid drive fan.
http://www.foundationpc.com/press/press65c.html


I assume you could get dealer AC in 64, but not sure if that included a fan clutch. I'm guessing no.

I got a fan clutch for my 65 AC car from RockAuto.com. You can use their website to lookup the correct part number.