98 GT.. NO heat on driver's side.. it was fine when it was cold,, but after I've been using A/C, I get no heat in driver's side when I turn it to 90. Only passenger's side blows hot.
It's like 'dual' mode is on, when not, and i'm at 60 and passenger's side is 90.
(I have digital dial HVAC control.)
I know something is bad. sticking, rather. Help!