The very small hose on the heater core of my 2009 Passat broke off. It’s warm enough now that I don’t need heat until I can save up and fix it right. How do I bypass the heater core? I connected the 2 main hoses, and started it but coolant was coming out of the little hose. When I plugged it, the car overheats. How do I bypass the heater core properly?