🚀 go-pugleaf

I have a slow leak in  my a/c system (Ford, factory
instalation).  It looses about 1 can of freon every two
to three weeks, and I can't locate the leak.  I've
cleaned all the fittings and connections and looked for
signs of oil -nothing. The evaporator doesn't freeze up, 
 even under continuous (8 hour) use, which makes me
think that the evaporator may be ok. 

Now I have to admitt, I have gotten my money's worth out
of it. It's got 290,000 miles on it, and the a/c system
has not been touched, except to add freon every now and
then the last couple of years.  Any good ways to find a
leak like this?  Should I replace the compressor, assuming
that it is the most likely source?  I really hate to replace
anything, regardless of age, if I'm not sure that it's
defective (that's what dealers do, in't it?).

Any advice will be appreciated. 


Mike Graham @AT&T Technologies 
Atlanta, Georgia
{ihnp4}akgua!mlg