If you have a eng block heater that heats the coolant, leave your car on defrost and shut it down, plug in heater, the coolant in the heater core will be slightly warmer causing the warm air to rise and run right up your defrost vents to your windsheild. I haven't tried this on my own veh but i heard it works. don't forget to jack up your washer fluid with strong deicer fluid.
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