How can I find an A/C leak in my car?

I have a 96 Ford Taurus. The A/C has stopped cooling. I have replaced the R-134(with sealant and UV dye) in it a couple of times but it stops cooling after a few days. I have tried looking for evidence of a leak with a UV light but can not find any. Are there any places where a leak commonly occurs?

How can I find an A/C leak in my car?
Ford was known for bad O rings at where the hoses connect to the compressor. If you are not seeing any evidence of the leak, it may be in the evaporator core, which is mounted inside the car under the dash. You may have to disassemble the dash to look for evidence of the leak there%26gt;
Reply:freon is flammable right? a match should do it then, but be carefull the explosion might damage the seats (among other things!)
Reply:dont mess with it unless u know wot u are doin but a u.v light should find it
Reply:Check all joints and connections with a spray of dish soap, look for bubbles. Put a small amount of soap in a spray bottle with water. Also spray the cooler, in front of the radiator(On most cars)