I'm thinking of making a modification to my defroster by adding an electric heater just below the defrost duct that goes up to the windshield. Nothing supper hot....I'd interlock it with the fan motor. Just enough power to defrost the windshield but not melt any plastic. I'm tired of having to wait for the jeep to warm up to get defrosting air. I'm impatient. Found this 400w heater on Amazon....2.5"x6" [ATTACH type="full"... Heater Box Defroster Mod?