Air conditioner not working

Air Conditioning problem
2004 Chevy Malibu

Hi,
I had the air on two days ago and it was working great. It was raining out so I had to put it on defrost/hot. When I turned the nob again for the air to come back on it kept blowing hot air and continues to do so. Heat/defrost works great but air just blows hot. Could it be a fuse that I need to replace? I hope you can help. I am broke because rent is due :) and am going to try to repair this myself. Thanks in advance!

Thanks so much! I've been studing my owners manual so I know right where that fuse is. I will try that. I sure appreciate your help. I'll post back if this works or with whatever the prob. Is.

After 5 days of the air not working but blowing hot air it started to work again on it's own. I prayed about it. Either that it would start working again or not cost much to fix and the next day it started to work again.

I just recenly add enegine coolant because my light was on. Whenever I drive the car is get really hot on my panel but will not blow out hot air only cold. Does this problem mean I need a new thermostat