While flipping through the FSM set for my '88 RX, I discovered that in Canadian cars there is a fresh air/recirculate button not found on the USA models. This switch looks to simply open or close the vacuum to the air selector flap, allowing for the use of recirculation in any HVAC mode.

 

I want this feature, but cannot readily find a vacuum switch with a button or knob control; the closest I can find are port vacuum switches, and they're all thermostatically controlled.

 

Anybody know of a switch suitable for my purposes, or will I have to try to get one from Subaru of Canada?

if you want it to look stock then probably have to go through subaru or use one of the stock buttons from a junk yard car in a different slot.

 

you may try looking for a vacuum valve. you could mount it somewhere and just turn on or off the vacuum as you see fit.