On May 12, 7:19*am, "Lloyd E. Sponenburgh"
lloydspinsidemindspring.com wrote:
"Bill Noble" fired this volley :

So, why does your experience differ? could it be a drier
climate, or could it be something else? *Note, I am not questioning
your advice/report, it makes perfect sense, I'm wondering why I can
get away with not doing all that stuff?

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



This must have been a cheaper vehicle. Most vehicles are built with a
pressure switch in the low side which shuts the system down long
before it pulls a vacuum on the low side.