angered at this point

[supramacist]

I may be wrong but wouldn't anti-freeze show up under a black light??

Or would it just go dark? Anyhow get the black light dye. Add it to the rad and go for a drive. Cruise the car wash and spray the under carriage. Get it clean and don't do anything until it's time to fill it up. Don't fill it. Wait for dark and hit it with the black light. Don't use the bulb. You need the flourescent.