Somewhere on a web site I once read that a 50/50 mix of coolant works better
at removing heat from your engine and has a higher boiling point than either
component by its self. Wish I could find it again.
Speaking of websites, for those seeking info on a/c conversion please check
www.epa.gov and type r-12 into the search. Select R-134a conversion from the
options. Lots of good info.

Tom Smith
83.5 Westie
Charlotte, NC