A couple of things to think about when doing calculations is the need to factor in
the atmospheric pressure of higher elevations.

This chart, for instance, at 5000 ft elevation, shows water boiling at 202.9 degrees and atmospheric pressure is 12.2 PSI.
Someone on another board implied that atmospheric pressure had no bearing on the boiling point because it was a closed system but wouldn't the air inside the system be from that elevation not from sea level?

http://www.webbpump.com/technical-s...eter-readings-at-different-altitudes.php

A good radiator shop in your area should also be able to tell you if the cap formula of 1lb adds 3 degrees to the boiling point holds true at your altitude. I think the altitude would affect this.


Last edited by randy luton; 02/05/2010 5:21 PM. Reason: rethought ratio of antifreeze statement
"Nothing astonishes men so much as common sense and plain dealing." - Ralph Waldo Emerson