Last year my '85 Westy was converted from Freon to Freeze 12.  How
does that relate to the R12 vs R134 debate.  Is Freeze 12 similar as
R12?

Anyway, at the time the mechanic said that the compressor was not up
to par and that it would probably need replacing soon.  It held up as
well as it could through the summer last year since I didn't use it a
whole lot.  Well, it isn't doing anything this year, and I am taking
a several week trip in July/August so I want to do something.  When I
get a new or rebuilt compressor, do I have to specify that I am using
Freeze 12?  What's the advice on replacing the compressor?

TIA,

Jim in Atlanta