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An A/C ? - '87 5kTQ

It's pretty warm here (D.C.) now, like mid-50's.  It's been sub-35 for about a
month, so my A/C hasn't tryed to come on for a while.  Last time it did, it
worked, now it doesn't.  The programmer is sending the signal for the
compressor to come on, but the signal stops at the low-pressure switch, which
means I'm out (low anyhow) on Freon.  Does freezing weather cause freon to
escape?  Maybe not being used for a month?  Like I said, it worked the last
time the temp was high enough to let it.  I don't really need the A/C to work,
but deforesting would be a little easier if it did I'd guess.  A trip to the
local mechanic should get that sucker charged up again, but I'd like to know if
this is a typical problem, or just a slow leak in my A/C system (this happened
last winter too.)  TIA!!

87 5000CS TQ
84 5000S (2,000 miles away and a mile high)
90 80 (sibling's mode of transportation I get lynched into working on)