2002 Hyundai Santa Fe blowing air but no cold or hot?
 

I have this weird problem where my cars blows air at all speeds but the AC and heater doesn't work, anybody know what it could be? Maybe blower motor relay?

Sounds like that little piece on the blend door is broken.
It is a lot of work to get to that part and to replace it.

Maybe this video will give you a better idea of what is involved