Why won't my engine reach operating temperature at an idle
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Engine can run for hours at idle from a cold start and will not reach 210 degrees (operating temp) I have replaced the thermostat 3 times with no changes as well as the heater core.
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‘COLD’ ambient temperatures combined with coolant circulating more slowly at idle and being rapidly cooled by the radiator - this condition is pretty much normal.. After revving engine for only a couple seconds cabin heat should be nice and warm.