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Cars can not run on just water because water boils at 212 degrees, no matter what. When coolant is mixed with water 50%-50%, the boiling point gets higher. Now,for every pound of pressure this mixture is put under, the boiling point will increase 3 or 4 degrees. So a 15 pound radiator cap can mean a possible 50-60 degree added to the boiling point. Now, a defective cap can decrease your boiling point.Thus a bad cap could be your problem

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โˆ™ 2004-09-10 01:32:00
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