I found my heater A/C door switch on this site. Hopefully it can be helpful to others. Auto-part.com Texasjack
i am changing the wiring harness from the 73 to the 74 because of major wiring probs..can anyone tell me the difference on the 73-74 wiring for the heater switch? have picts? also the harness on the 74 has a box often called the dreaded yellow box(its black) what the F does this thing go to or do? anyone hav a good wiring harness for the 73 with A/c?...always one thing or another..maybe just need a break away from this for awile but the boy is all excited about the mav being his first car and i am excited because he chose it over a ricer..any help would be greatly appriciated