I bought a used '04 with a bad a/c compressor. Removed old compressor and condenser, flushed, replaced with all new + dryer. Vacuumed, charged it, and it worked fine in cool weather. When the weather got warmer it went intermittent on me. It cools for 15 seconds then off for 1 1/2 minutes then repeats like clockwork. My wife timed it for a good 20 minutes while I drove. Charge still shows good. Can anybody help? Go easy this is my first post.