I was told that one cannot simply add 134-A to a cooling system that's only
blowing about 57 degrees.  They said the system had to be totally evacuated
and then filled with a precise amount.  Anyone know about that?  I've always
had Freon added in the past (it's been R-12 until a few months ago when I
had the system converted to 134-A).  Is this something peculiar to 134-A or
just peculiar to this shop?  They're talking close to a couple hundred
dollars to do it.

Bob Trousdale
'90 Westy