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You may do so, however you car will not run at it' s optimum temperature. Because antifreeze is "thicker" (viscosity wise) than water it retains heat longer. Some people run only water and this cools the car fine however......water doesn't contain the lubricating and anti corossion properties that antifreeze does (let's not forget that antifreeze when mixed 50/50 with water keeps you engune from freezing in cold weather)..... If you run ONLY water (i.e. Have no issues with freezing) add a pruduct such as "waterwetter" or "black ice" for lubricity purposes.
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