1948 to 1954 a/c sytem on the cheap?

[fredscarryall]

i need a cheap a/c and heater system for a 1948 to 1952 pickup.i know it doesnt get very hot in oregon.we still get 80 plus and it would be nice to have a/c with defrost.because we get alot of rain during the winter and windows fog up really bad.i know about all the aftermarket companies. but is anyone using an a/c system on the cheap, like out of something i can find at a wrecking yard.pictures would be helpful too