Replaced back unit AC last year. AC does not run now again. Have back unit off. does that have anything to do with it? want to replace vaporizer vacumm unit under dash

What is your question?

had new unit put in back of Tahoe last year. (has one in front two) now AC does not work again. had dye run thru it. said saw no leaks. had back control off. COLD NOW but wants to replace vaporizer vaccum under dash