Cannot tell why / what is wrong --- only from a post, but generally the cardboard interlock cams inside the switch fall apart, need replacing. They are in grease it just makes paper based pieces fail. If you push one button , the last one pushed before that one, should come out almost all the way….if not , or some are hard to press , cam inside is falling apart. Being heavy cardboard , WD40 might make it fall apart more, but could reduce friction for now. . when interlock cam moves/slides sideways, that is what moves the vacuum switch, selecting canisters to act---not the push buttons directly. But seeing if buttons come back out tells you it is moving. New cams are engineering plastic (delrin) .
Vacuum leaks are another whole separate issue ; there is a lot of info on 300 site on that, and how this works, I believe? Canisters (the operating cans) can be checked with a mity vac . On both sides. Should hold vacuum. But check hose to engine , especially, often damaged while working on the engine .
If you unplug the vacuum hoses , at the switch, do NOT wiggle plug side to side trying to get it off, it breaks off the little nipples ; go straight back with plug when removing, might need help from small screwdrivers etc. take whole assembly out, then unplug carefully ? ? This from F -----I have never worked on K switch in the car.
Hope this helps
Hi group, my mechanic sprayed WD40 into the heat defrost AC controls that were real stiff, now there easy to use but they do not work, should I rebuild the control or do I have a vacuum leak. Before the WD40 the controls hardly worked for AC, defrost, air flow.
Harry in Portland OR
Posted by: "John Grady" <jkg@xxxxxxxxxxxxxxxxx>
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