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Hey all, With these 4 and 5 button vacuum controllers for heat/defrost/ac, it's my understanding from the articles I've read that there are plates that slide back and forth to allow vacuum to be applied to certain pathways within the system. Picture of a non-AC vacuum switch disassembled...

What would cause an AC system that is apparently fully charged NOT cool effectively any more? Here's the history: The AC system in my 66 Chrysler T&C (dual AC) has been working splendidly for YEARS up to the last few months - meat locker cold under almost all conditions. Back in the 90s the...