I thought u wanted to bypass. Never fun driving while wiping or scraping inside of windshield. Been there.
W
That would solve the leak, but BTDT on the defroster-less windshield too.
When i lived outside Fbx My old Toyota ext. tank heater (for winter starts) released the check ball (backflow preventer) one winter at about -30* or so. Def went from warm to -30 right now. Very inconvenient for a few days. Had a 80 mile RT commute.