i was driving down the road this just heard all this hissing and steam starting comming out the windshield vents. i pulled over and all my water/coolant was pouring to the ground!!.. im pretty sure it was the core right?? but i just had my whole dash removed like 2 weeks ago and just finished putting it all back in what causes the heater core to go bad?! i was just driving! o and yes there was a little water on the passenger side floor