See if you can trace it back to it's source. Get under it with a flashlight and start lookin. My GUESS would be a hose is leaking at a fitting. I HOPE that is all it is. If you still can't find the leak static, start it up and CAREFULLY look under the VX and see if it starts leaking. Did you do any maintenance to the cooling system lately? Did you add any antifreeze? Check to see that your overflow reservior is not to full. (please forgive me if I am oversimplyfiing (sp) the situation but NEVER open the radiator cap when it is hot...)

John