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I bought an NOS vacuum switch on eBay, part #3431020...for my '70 Suburban non-ATC wagon. The vacuum part now works great, but the AC compressor and blower motor stay on all the time regardless of what mode button is depressed. I've heard that Chrysler did that on purpose in some later years...

I've got a '70 Plymouth Suburban that has a very long-term dormant factory AC system. First thing was replacing the inoperative blower motor and this week, took it to a shop that can deal with old car AC systems to evaluate what all is bad and make a decision on a repair or install a retrofit...