ONE THING THAT I'VE FOUND THAT MAKES IT HARDER TO FIND FREON LEAKS (r-134A OR R-12) IS THE AIR AROUND YOU. IF YOU HAVE A SMALL LEAK EVEN THE SMALLEST BREEZE CAN MAKE IT ALMOST IMPOSSIBLE TO FIND ,NO MATTER WHAT KIND OF LEAK DETECTOR YOU OWN. MAKE SURE YOU HAVE... Login to read more.