See if the tips on this page help: http://www.1962to1965mopar.ornocar.org/ml-62-65heaters.html Did you check the vacuum hoses to be sure they are not unhooked /cracked / leaking? Thanks, Gary H. Jeff Adams wrote: > > Hey guys, I'm trying to get the heater switch in my 64 Polara working. > It's not switching vaccum controllers like it should. I replaced the > non-working original 4 port vaccum switch a few years ago with a new 5 > port A/C switch and just cut the bottom button off. I don't know if the > problem is with the switch or something else. I can get hot air out the > defroster, but only cold air out the bottom. Am I correct in assuming > the A/C switch routing is the same as the non A/C switch internally, or > are they just not compatible? Does anyone have a working 4 button switch > > they'd like to sell? > > Jeff Adams > 64 Polara ---- Please address private mail -- mail of interest to only one person -- directly to that person. I.e., send parts/car transactions and negotiations as well as other personal messages only to the intended recipient, not to the Clubhouse public address. This practice will protect your privacy, reduce the total volume of mail and fine tune the content signal to Mopar topic. Thanks! 1962 to 1965 Mopar Clubhouse Discussion Guidelines: http://www.1962to1965mopar.ornocar.org/mletiq.html and http://www.1962to1965mopar.ornocar.com/general_disclaimer.html.