I agree with both of y'all. the point I was trying to make is this, Todays mechanics and techs would be looking for another job if they really had to find out what was screwing up, instead of just changing part after part until the problem was fixed! Please don't misunderstand me TB I'm not refering to you! I'm just saying we should start teaching the people just starting something other than how to change parts. Pretty soon the way things are going, if a system leakes out enough refrigerant to cause a problem we're gonna have to replace it!