I have the strangest symptoms on my Genesis. I originally thought the heater would not blow hot, but turns out the heater will only blow hot on hi, I lose coolant but no leaks inside or out, after driving a few minutes the passenger side of the windshield will get vapor smoke coming out from the hood/windshield. The motor oil looks fine and no white smoke from exhaust so it's not a head gasket. If I set the heater to 89 (the last digital numeric before hi) it starts blowing cold. wtf? I am running out of trouble shooting parts.