Rocket J Squirrel wrote: > Well, that certainly complicates things. > Not terribly. The same glycol concentration that depresses the freezing point to protect you in winter raises the boiling point to protect you in summer as well. As long as your cooling system is adequate (e.g. not a stock vanagon in the desert) the pressure maintained in the cooling system will be high enough to keep the water from boiling. But if the cooling system is marginal, you'll reach the maximum system pressure (start dumping in the overflow) and further temp rise will cause boiling. A 50/50 mix (volume/volume) of glycol will raise the boiling point significantly (about 15°F or so - at standard atmospheric pressure). Unlike the freezing point depression, which maxes out at about 70% wt/vol of glycol/water then decreases, the boiling point continues to rise with concentration. Basically, if you're boiling a 50/50 mixture, you got mechanical problems. Keith Hughes '86 Westy Tiico (Marvin) |
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