A/C Car Trouble 2001 Honda Civic LX *A/C Blowing Out Hot Air*?

My heater works great but my A/C is acting up. im hesitating going to a shop affraid theyll charge me something outrageous and take advantage of me for 1 me not knowing any better and 2 me being female. lol. but my brother checked the coolant level (?) and said that it was fine and that there wasnt a leak. if i listen real hard and try to turn it on i hear the fan (?) try to turn and sound dirty or turning slow (?). i guess im looking for some suggestions on what could be wrong but better yet an answer. please help i would love to know what was wrong and about how much it would cost before i go to a shop. thank you for the help and taking the time to read this. and