need some mechanical help

i gotta 95 trans am with the lt1. somehow i got an antifreeze leak but cant find where its coming from, ive had it pressure tested and ran on teh computer and stuff and it came up with nothing, its even sat and ran in the driveway for at least an hour and there is no puddle. then i get it home n the low coolent light comes on n the reserve bottle is bone dry. does anyone out there have any ideas. thanks

check all your hoses first. then the overflow bottle. After that, I would look for signs of a leak near the engine. start the car up and let it run and find if there is a sweet smell coming from the engine bay. make sure its not windy outside. if you smell something sweet, it means you have a leak so then you just have to find it. Good luck