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If you live in a warmer climate that doesn’t see prolonged below freezing temperatures, then you’re better off running straight water than a water/coolant mixture, as straight water is more effective. However, we do suggest a coolant additive like Design Engineering Inc’s (DEI) Radiator Relief. DEI’s Radiator Relief includes rust inhibitors, anti-foaming agents, is biodegradable, and non-toxic, unlike most antifreeze products. It also aids in cooling by improving thermal transfer.