lil bit of a defroster problem

[camshaftgsxr]

'84 silverado my dad and i tore out the old wiring harness after it fried and some pieces were kinda left out on the reinstall (seems to happen a lot ) and i'm gonna need a diagram or a description on how the heater/defroster are put together, it is an a/c truck with all the a/c stuff taken off. freakin rednecks i bought it from... but it is wired right now just when i go from heat to defrost the fan spins up faster but it keeps coming out below the dash

thanks guys