2003 Buick Rendezvous Heat issue

Heater problem
2003 Buick Rendezvous 6 cyl All Wheel Drive Automatic

On the passenger side, the air on the face vents blows full force, but no hot air. No heat at all comes out of the passenger side. On the driver side, a little heat comes out, but really not that much air. On the driver side, everything blows full force (defrost, floor), but not the facial vents. Little to no air comes out. So, really are there two problems or could they be related (no heat passenger and little force air on driver face vents)? Do you think it is the thermostat. Other than thermostat replacement, should I look for something else?

Also, all power windows work fine, but the driver side making a terrible noising when moving up/down. Sounds like something is about to break or pop. I quit using, but how could I fix this on my own.