Leaking Radiator ?

Hello...... How do I check for a leaking radiator? I don't have my hose yet, so I can't hook it up to the pump.
Can I fill the radiator with water plug one end and blow into the other end?
Here's a little background on my situation. I was installing my bix into my case, after I removed the bix it looked like I hit one of the tubes with a screw. I really can't tell if I hit the tube because of the mounting for the screws covers the tube on the bix. If I hit the tube it would leak pretty good, correct?

Any input is appreciated,
fdoggiedog woof woof

that would work! OR submerge the core in the water, leaving the barbs out of water and then blowing~

You could put the whole core under water, just put a hose on one end and your finger over the other and blow through the tube realy hard a few times.

Well I tried both ways and no leaks!

Thanks guys,
fdoggiedog woof woof