Date: Fri, 14 May 1999 11:48:11 -0700
From: RED <davharnopsamnet.net>
Subject: Re: Antifreeze 50% water question?


redbat50nopsamejanews.com wrote: > > In article <37393376.3A8Dnopsamnk.com>, > kenwashnopsamnk.com wrote: > > Damon, > > > > The Bentley manual, Haynes manual and the owner's manuals call for a > > 50/50 mix on the water and antifreeze. If you are really smart, you > will > > use distilled water for the mix, especially if you have hard tap water > > in your area. Distilled water has no minerals and is less likely to > > cause corrosion problems with the aluminum parts of your engine, as > well > > as cause mineral buildup in the cooling system. Using a straight > > antifreeze mix does not help things. Check out Motor Trends' Oct. 1998 > > Car Care section. It goes into pretty good detail. > > > > Ken Washington > > While I would always use SAAB filters, although I am not really sure > that they are that much better than the better aftermarket filters, what > about using a different anitfreeze. BTW I was told by an old time > mechanic that if you use 100% antifreeze you actually got less protction > than 50/50. > Sam F. > '90 9000 CD turbo > > 87 9000S > > 87 900S > > 83 900T > > > > -----------== Posted via Newsfeeds.Com, Uncensored Usenet News > ==---------- > > http://www.newsfeeds.com The Largest Usenet Servers in the > World! > > ------== Over 73,000 Newsgroups - Including Dedicated Binaries > Servers ==----- > > > > --== Sent via Deja.com http://www.deja.com/ ==-- > ---Share what you know. Learn what you don't.--- Here's an explanation from a chenmist (me). Your mechanic is correct. Almost always, a solution of one substance in another will have a freezing point lower than the freezing point of either of the substances by itself. Thus, the mixture will freeze at a lower temp than if the radiator contained only antifreeze. I'd suggest following the directions on the "antifreeze" can. Remember that the stuff also has to act as a coolant. Mixing antifreeze with water raises the boiling point of the water. Technically, for cooling purposes, it would be best to have 100% ethylene glycol (antifreeze), which would have a boiling point of about 200 deg C (about 390 deg F). However 100% ethylene glycol freezes at -13 deg C (about 9 deg F), which isn't low enough in cold climates. The antifreeze manufacturer's recipe for mixing probably gives you the best blend to serve both purposes.

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