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Hi. What year and model is your BMW?
The heater core hoses go into the firewall. The hoses would have to be removed and connected together to bypass the heater core. It is a bit of a project because you will have to cut the hoses and install a fitting to connect them together. But the easiest way is to get 2 pinch off pliers or vise grips and just pinch off the lines so coolant will not leak.
Yes it does. You need to pinch all three.
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