How to locate and confirm a hole in a cars Air Conditioning AC Condenser

Think your AC Condenser might have a leak?
Here's how I confirmed that using a small compressor top pump about 20 psi into the condenser. The condenser was then submerged in the bath. You could use a foot pump or even a bicycle pump to do the same.
This condenser is from a 2001 Ford Focus, but I'm sure you could use the same technique for any car condenser.