Hi Everyone.  I saw a couple posts lately asking about upgrading R-12 
to R-134A refrigerant.  Check out this web page.  This step may not 
be necessary.

http://worldserver.com/R-406A/

Harry.
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Harry Yates, Langley, BC, Canada
'90 Syncro Westfalia www:   http://www.bcit.bc.ca/~hyates
'87 Golf Diesel      email: hyates@bcit.bc.ca