Does it actually boil over on you, or does the dash temp gauge just indicate that the engine is hot? If you aren't actually boiling over it could just be temp. gauge problems.
Well the thing is the car doesn't have a coolant reservoir ("catch can") like my Duster so the small hose coming off the radiator cap just empties onto the ground. After driving the temp would continue to creep up and then the cap would start releasing water and it would start to form a puddle. Also the owner said the last time he drove the car it did overheat; there was proof of this as the radiator was about half-empty when we first checked.
I have a small infrared temp gun (more like a small stopwatch-looking thing) that should work but where is the best place to point it?