anybody have any idea how the heater/defroster assembly that is 12 volts works. it is the one that looks like a square box that is aftermarket. comes with everything to hook it up. mine in my 54 chevy pickup is leaking pretty good and also it defrosts the front windshield good just not the side windows when i'm in it driving. makes a seeing hazard. wasn't sure how well it worked in the northern part of the us. im in missouri and it has been getting cold. the little heater doesn't do to bad but could do better.
