heater pull and turn switch

[familyfast64]

Hey guys, real quick, I replaced a leaking blower motor with a new unit that isn't sealed like the old one. anyway when I turn it on by pulling the knob out and turning it one or two clicks nothing happens. Under the dash I noticed there's four terminals or male ends of the switch for wires to plug too but only one wire is hooked up. It's a new wiring harness with the fuse box like newer cars have. The blower motor has the one wire plugged into it. Coolant gets hot in the hoses there even before the thermostat items up but I assume that's normal as heat rises from the block. Could you tell me if I'm missing something? I know its hard, lol but if you could tell me for sure that one wire is not enough running to the switch on the dash then I'll take it from there I guess. Oh and I also tried swinging the handle underneath but nothing seemed to happen. I need to purchase a book on the truck just to learn about the heater.