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I notice that my engine runs about 10-20 degrees cooler with the heater on... Depending on how high the heater is turned on. They do say when your engine coolant has overheated to turn the heat on high and to the floor. open the windows etc. The coolant is where you taking the heat from, if they could harness the extra heat that's just ambient in the engine bay, then that would be even better since the coolant is actually doing something.
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