Had a similar issue a few years ago. The car has some front end fender bender and the condenser was pushed/bent and held on until the vibration wear a hole between it and the radiator. The compressor will turn off after a few cycle. I bought it in to a mechanic and he use a fluorescent freon to find the leak, and quote me $500 for the repair. I just paid him a $65 diag fee and bought a condenser off radiatorbarn.com for about $100, install it myself, and check on craigslist to find a licensed AC repair guy to charge the system up for $100.
Still running very cold.