So, I have a 1963 Chrysler 300. The heater switch and box all work except the three vacuum actuators on the box are junk, which explains why the PO had the incoming vacuum source disconnected (they leak). These are dual-port actuators, part 2277091. They don't seem reproduced, and the couple of NOS ones for sale I can't imagine are still any good with 60-year old rubber.
I'm guessing some of the specialized rebuilders like Original Air might have the expertise to rebuild these if I'm...
heater box dual-port actuators?
