Hello All,
Hoping you all can help me out here.
I have the same issue as the first poster in this thread. I just finished an overhaul of the non-working AC system, new seals, gas, etc. etc.

My issue is getting the compressor to run with anything but the defrost button. Now from this thread I have figured out about the blend door rheostat and how it has to be closed completely for the compressor to kick on. I have been able to put a voltmeter on the leads and see that I have 1.1V or so no matter what I do with the CCU. (BTW that CCU just came back from ProgRama in FL where it got new caps and soldering fixes).

I have figured the rheostat is good, when I pull vacuum on the 4/3 hose going to the blend pod, the voltage goes up to around 4.7V. I'm not sure if that is enough to kick on the compressor but nothing happens.

So I'm not sure if I have one issue or multiple. I think my vacuum block is not pulling the right vacuum on 4/3, but I'm not sure if that's bad CCU order or a bad switchover block. and when I get the voltage up manually I cant figure out why the compressor still wont fire.

I feel like I am missing something in the order of operations or misunderstanding what I'm reading but any help here would be great.

Thanks all.