No heat on passenger side 95 lesabre

I had a problem with no heat, and replaced the thermostat. Seems to come up to temp OK now, and heat comes out the driver's side, but not the passenger side - it's cold, whether it's on the vent or the floor setting.
I have the Auto Climate Control, and have the passenger side set to full heat. Checked all vacuum hoses that I could find.
This doesn't seem like it's going to be cheap!

Thanks for any help.

Turn the ACC controller off/on to see if it will reset. You may have to do it several times!
If you can’t get it to reset, then suspect air diverter motor malfunction or vacuum problems. :crying: