Air Conditioning/sunroof 1993 Audi 90 cs

Everyone,

I need some help. My airconditioning and heater is working, but very
poorly. when i turn it on there is a loud noise that comes from
underneath the dashboard, like something is broken, maybe a fan or
something. i have no idea what is making that noise, but i would like
to know so i can get it fixed. so if anyone knows what is causing it
let me know. also, my sunroof seems like it is off its tracks or
something. it has trouble closing properly, but has no trouble
opening. maybe someone can direct me to another area where people
have discussed that. thanks very much!