no vacuum to hvac control

I recently purchased a 2019 Buick Encore. I live in Florida and in the early morning and into the night I have a condensation problem on the outside of the window. The AC blows through the defrost constantly. The defrost feature does not seal off like every vehicle I have ever had. The Service...

Ok so I have a 1998 Regal LS nonSC Auto Was having problems with A/c blowing weak at the dash vents and I thought it was the Passenger Air scrubber. I replaced it as I couldn't remember when it was last done. Didn't solve the problem but the air smelled better (no more rotting plant life). So I...