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No, the block heater will only heat as much as the resistance of the element is designed to. There is no harm leaving it plugged in. You should, however, always unplug it before starting a vehicle because the movement of the coolant across the hot element can eventually wash it out and create a break in the circuit which will require replacement of the heater element. Most OEM block heaters also have a thermostat built into the cord itself to make sure it does not overheat. I would not plug in at temperatures above freezing.

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Q: Can the block heater do harm if left plugged in too long?
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