To all,
        A few weeks ago I posted a question on the
advisability/practicality of changing my (dead) stock AC over to 134A.  I
received a lot of info, and after much thought finally took the van in to
get fixed.  I really wanted to try Freeze 12 (per Ken Wilford's good
results), but neither of the shops I called would use it, and I don't have
the tools, knowledge, or time to do a proper job myself.  So, rather than
immediately convert, I  decided on the plan to have them check the system
for leaks, identify needed parts, compare with conversion cost and ultimate
cooling ability of repaired versus converted system.  Big Caveat: I live
just south of Tallahassee, Florida where summer has been in full swing for
a few weeks, and average summer temperatures & humidity range between 85-
99 degrees with 75-100% humidity.  Basically, I was willing to pay for
absolute cooling ability.
        After being checked, it was determined  a new receiver/dryer was
needed, in addition to a full charge of Freon (3lbs, expensive).  They
quoted me the price for an available aftermarket receiver ($90) versus
ordering an original ($160);  I wanted to go with the aftermarket if they
thought it would be as good.  They said it was fine, so proceeded.  This is
getting wordy, so I'll cut to the chase: turns out aftermarket wouldn't
work, parts store had the original in stock (for which I was only charged
what I agreed to- the $90).  They followed every proceedure (leak checks,
vacuum, etc) that has been addressed on this list, and I paid for it.
Guess what?  What has been described to me many times as a bad system, is
actually pretty darn good when properly serviced.  The cost- high, but
within what I had "guestimated" for when I bought the van.  Thanks to all
who have sent in info on this topic, and hope my little bit of info helps
others.

Regards,
Mack