Thread: 12v auxilary coolant heater from a BMW
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Old 08-20-2014, 04:52 PM   #12 (permalink)
Daox
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I just want to say, heating the coolant with an electric heater that is powered by your alternator is not going to increase your mileage. If you do this for defrost/heat reasons its valid, but its not going to earn you better fuel economy.
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