Does anybody know why my air-conditioning only blows cold on the passenger side on the driver's side It barley bows cold most of the time it is warm

I read on the internet that it could be the blend door does that sound right? And if it is where is it and how do you get to it?

If the passanger side is cold and the drivers side is just cool. You could just be low on freon.

I have not had a door problem so I do not know about its location. But i do seem to remember seing information about it in this forum.

ive already checked the freon. does anybody know where the blend door is?