I think I may know what the problem is, but I revved my engine and coolant just flooded my driver side floor from the lower vent area. I hear a gurgling noise and my driver side windshield got fogged. I have a ball valve in place of my aux water pump to shut off coolant flow to the heater core as my heater valve has lost vacuum so I was getting heat all the time. I closed the valve to prevent coolant flow, but I'm not sure if coolant is able to still flow through the heater core. please see the picture. My question is: Is there a way to temporarily fix this problem? are my suspicions right, is it the heater core?? What are the dangers of this to the car other than loss of coolant and over heating? Please help.

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1990 190E 3.0L