Brett, good deal. Glad you found it.
Apparantly the old monovalve was kinda jammed, and it would click and try to open, but not well enough.
Sounds like the vacuum system is okay - oh, the recirculate button is higher up, near the hazard switch, has a circle on it and a little red light when it's on. Push it and you'll hear a big dif in air flow noise.

Also, that metal pipe on the passenger side shouod be really hot if the engine is warm and the heater is on.

Easy fix, I'm enthused. My system is randomly switching to defrost vents for no good reason, but it's heating. But I may just go into the monovalve and see if I get lucky. Doesn't make sense to my analytical side, but always try the easy stuff first.

These systems have some weird, complex stuff; an oldtime mechanic at the dealer told me the system does a periodic check on the auxiliary water pump avery 15 minutes or so. If the pump doesn't return the proper current/resistance reading, the system pops the monovalve wide open for 15 seconds to help heat the air. Happened to mine - AC would go full hot for a few seconds every 15 minutes. Repaired pump, all fixed.

Cheers,
DG



DG