Awesome. Thanks so much.


Now I need to figure out what is going on with the extra vacuum lines to the extra valve

It does look like there are some aftermarket vacuum line t's installed (the white plastic kind you get at the autoparts store). Maybe I can just trace them and eliminate those extra parts.

The vacuum line to one valve is black with a red stripe and the one to the other is black with a green stripe, then the second line to each valve is just a smaller black line. And it is actually two of the older, original style metal valves with two vacuum lines to each. The a/c was converted to 134a at some point (the is my late grandfather's truck), but that wouldn't have anything to do with the heater loop at all would it?