Air Conditioner

What is your question?

When I bought the car 2 months ago the air was so cold it would freeze you out, at first the air would not get as cold, then it just started to blow hot. It shows a full charge, clutch kicks in, fan works but it still only blows hot. What could be wrong and would the parts be costly? I love my Jetta and would not take anything for my car because other than some minor repairs it has an awesome car and runs like a brand new one with over 200,000 miles on it.