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A mix of 50% clean water and 50% straight antifreeze will protect down to -34 degrees F. You should have what is in the system tested to see where you are protected to. Your local auto parts store can sell you a coolant tester for cheap.

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10y ago
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Q: How much coolant and how much water should you put in the empty reservoire of your 1999 Mazda b2500 in winter in Colorado?
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