I had thought filter driers were chemical system. And that
you couldn't restore them. Maybe on cars, you can?

Yes, I easily imagine it drawing the system full of
humidity. And of course, the compressor oil is hydoscopic.

--
Christopher A. Young
Learn more about Jesus
www.lds.org
..


"Lloyd E. Sponenburgh" lloydspinsidemindspring.com wrote
in message
. 3.70...

This particular vehicle had - at one time - a leak on the
low pressure
side of the compressor. It had been run like that,
recharged, run,
recharged over and over without fixing the leak.

So it was sucking in non-condensables more or less
continuously every
time it ran out of refrigerant. In Florida, those consist
of both air
and prodigious quantities of humidity. The long pull-down
was partly due
to sucking the moisture out of the filter-drier (which can
be re-dried
with a long-enough pumpdown).

LLoyd