Well ive been reading alot about people rebuilding their entire A/C systems or just simply fixing theirs by recharging the freon. I have tried the freon, and no improvements. So I am pretty sure my system is broken somewhere. Can yo guys help me figure out how to trace the problem. I am not too excited about rebuilding it or swapping out every component. What are the different components in the AC system and how do I test each one to see if it is running like it should? It is summer now as you all obviously know... my AC blows air, when the engine is cool it will blow outside temp air.. but once the car is warmed up, nothing but hot air comes out of the vents. The previous owner converted to r134a he told me. I tried to fill it up, no luck. Still sweating in the 87 260e. If my air is blowing... what does that eliminate? What is working since its blowing? SInce my air is only blowing hot... what are the possible problems with the system?

ALso I think i overfilled the freon a little when recharging, is this bad?