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Jack's right. It's important to find the right mix of coolant. Plain water is the best at transfering heat, but it's boiling point is 212F not under pressure. The more pressure you put it under, the higher the boiling point, so I like to use 25% propolene Glycol and 75% distilled water. Also remember that your gauge is telling you the coolant temp, not the engine block temp. Water will give you the best heat transfer and get these two temps the closest together.....
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