we rebuild these at forward look parts —- even if you broke off some of the vacuum nipples See newsletter we use delrin cams , they are cnc machined inside . The factory cams are essentially greased waxed cardboard — real junk , buttons stick wont come out etc as cardboard cam edges wear off over time NOS will do the same thing The non ac 5 button are the same across many years, 59 up , have many part numbers due to changes . The 4 button dodge/ plymouth switches use the sane internal cams and parts less one button so are the same size ,,same vacuum setup minus one button The AC seem functionally interchangeable but wiring variations and design of large switch on back of main fan contacts change — for good reason.. , They had a lot of trouble especially with AC fan contacts overheating and causing the contacts to move backwards into the melted housing , causing intermittent no fan ( plastic melts ) to fix that we have to solder rapidly the flag to the contact rivet ( which always melts it more ) and then machine with an end mill the plastic contact pocket and contact too, to get it flat / level again. Why it happens (big lesson here ) if you pull hard and wiggle the wiring plug on the ac switch you DO loosen the rivet carrying current and them it overheats and melts Then no fan . The non ac can also melt due to poor spring tendon on internal slide contact , that can be fixed if housing not melted badly ; once it gets hot the spring loses tension remove main fan plug carefully on AC with smooth prying with screwdriver against housing . It was tight at factory install as it was just pushed on , it was never pulled or wiggled . Best cure is a 40 A relay , takes rewiring but repaired ones are the same as factory, actually better as solder solves loose rivet and so most overheating . Cannot be done without the milling , the contacts will tilt and sink into plastic Been there similar —never wiggle vacuum connector to get it off , you will break off the small nipples . straight beck only with pry screwdrivers at each end , some have retaining clip throw that away fighting with it breaks nipples too A very small amount of silicone grease on male pin seals it ( keep out of holes) and makes it easy to get off While on this a subtle problem with poor actuator movement is not the switch ; the actuator rod slides through a rubber bushing that gets hard and leaks vacuum only in one direction.( rod out) — silicone grease helps on rod No one makes these to my knowledge but they are similar to otter cars , however many gm have one hose and spring return A project for someone? can be done … check diaphragm, w mity vac , they fail hope this helps jkg On Dec 3, 2024, at 8:31 PM, 'Matt Allyn' via Chrysler 300 Club International <chrysler-300-club-international@xxxxxxxxxxxxxxxx> wrote: -- For archives go to http://www.forwardlook.net/300-archive/search.htm#querylang --- You received this message because you are subscribed to the Google Groups "Chrysler 300 Club International" group. To unsubscribe from this group and stop receiving emails from it, send an email to chrysler-300-club-international+unsubscribe@xxxxxxxxxxxxxxxx. To view this discussion visit https://groups.google.com/d/msgid/chrysler-300-club-international/5798ADC8-C364-4680-8D32-6F20D2165165%40gradyresearch.com. |
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