All you guys and gals out there with coolant leaks See if you can get your hands on a coolant pressure tester that you use on the rad. It looks like a rad cap with a hand pump and psi gauge. Pump it up to 12-16 psi and see if it hold pressure. If not look for the leak. If is outside the engine you will see and hear it.( make sure rad is filled up first)
There is also a way to test your rad cap. And a test for a blown headgasket.
Fireplug

Some shops also pour some liquid in your system that glows in the dark to look for the really hard to find leaks