Pure Sol

95 del sol with R134A. Had a/c for a little while and all worked fine, came to a stop light and started to blow warm. After popping the hood and checking I noticed the fan stopped working. Plugged a new fan in and since then I have had high pressure (350-400) on the high side. I was told by one of the guys at work to clean the lines out with compressed air and brake clean and possibly it would clean out some build up. Did that and still have the high pressures. Any suggestions on what to check next?