AC vacuum question
The "switch" has to be attached to the temperature control lever for the heater/ AC. Are you saying it's missing or was never a place for it? I'm not familiar with changes for these over the years. I recently bought a 74 Scamp and have not looked at it or touched it this winter. If I get time, I'll try and take a gander later this weekend.
Here look at this, from the "CTC Auto Ranch" website.................
CTC Auto Ranch Misc. Parts
http://www.ctcautoranch.com/Misc. P...odge Dart Heat and AC Control For Parts 1.JPG
The two separate hoses are the device you are looking for