Coolant and Mixture Question - Ford Powerstroke Diesel Forum
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post #1 of 2 Old 12-08-2012, 06:10 AM Thread Starter
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Coolant and Mixture Question

I was checking my coolant with a tester today. It had protection above 275 and less than -45. Im afraid I have to much coolant and not enough water in my system. I have the red ELC Cat 1 coolant. Is it harmful to have to much coolant? What will it do? I dont seem have engine coolant temp problems, they all seem normal. If I need to drain it out should I just drain a gallon and replace with a gallon of distilled water?

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post #2 of 2 Old 12-08-2012, 07:04 AM
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There are some misconceptions regarding, the amount of antifreeze and water for protection in winter weather and sub-zero climates.

A mix of water and antifreeze EXCEEDING the 50\50 ratio (say 70\30) increases the freeze point protection down to -72 degrees F, but at the same time, it will reduce the cooling efficiency of the system. Plus, when the weather warms, such a 70\30 mix could cause the Engine to overheat.
A blend of 50\50 (water and antifreeze) brings protection down to -34 degrees F.
On the other hand, a 100 percent antifreeze solution (no water mixed in) has a freezing point of only 10 degrees F. above ZERO, it could turn to pure slush when outdoor temperatures drop lower than that.

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