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Unread 05-02-2013, 10:57 PM   #16
Registered User
1995 ZJ 
Join Date: Dec 2010
Location: Norman, OK
Posts: 2,006
Antifreeze is not just for winter, though it lowers the freezing point of water, it also raises the boiling point too. Antifreeze/coolant provides protection from corrosion and rust and fights mineral deposits from water. Another side benefit to anti-freeze is leaks, it doesnt evaporate and dry quickly plus it is dyed so unlike water it will leave more evidence behind when leaking.

A stronger water mix ratio will provide better heat transfer but I would at least try to run around 25-30% anti-freeze just for the other benefits. There are also additives you can put in the system in lieu of anti-freeze to supplement the water or supplement the heat transfer properties.

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Unread 05-03-2013, 10:42 AM   #17
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1996 ZJ 
Join Date: Feb 2010
Location: Smithville, Texas
Posts: 246
Water boils at a lower temp than 50/50. I would use some antifreeze.

Edit: jnicewan beat me to it.

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