I have been having A/C problems for the last few weeks and I 'm hoping some of you on this board might be able to help. I first noticed that it was blowing warm so I took it to the mechanic and he said the system needed flushing. He flushed the system and replaced the receiver dryer, expansion valve, and filled with freon. That was done several weeks ago. Last week I noticed that the A/C was blowing not as cold and now it is not cold at all. My compressor still comes on (even now) but I thought that the freon might have gotten low again so I was going to just use a kit that I bought at Auto Zone to recharge. Before attempting to add refrigerant I checked the pressure. The pressure measured 100 PSI, which is WAY too much pressure. The safe zone, according to my guage is 45 PSi or less. What is going on with my A/C for the pressure to be so high?