finding freon leaks

["Walter" <Whalt@xxxx>]

I am trying to locate a leak in my a/c system and am having some trouble
doing it. I just bought a leak sniffer from NAPA and put it to work. So
far I seem to be finding a high concentration of CFCs between the frame and
the fuel tank near the point where the flexible fuel lines meet the metal
fuel lines. On the highest setting, the sensor beeps looking into the
condensate drain line, but then it also beeps looking up my shirt sleeve.
(Are my armpits THAT hazardous to the ozone layer?)

My theory is that freon is leaking through the condensate drain line or
coming somewhere off the evaporator near the 'fire wall' and collecting in
the low spot on the frame. Can anyone give some words of wisdom on how to
proceed from here? I don't see any greasy spots from leaking refrigerant
oil. Should I try to pull the tape/insulation surrounding the evaporator
pipes via access through the spare tire panel, or should I attack it through
the passenger foot well? I tried sniffing through the rubber hose on the
a/c blower and don't find any CFCs there.

Walt Tampa, FL