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HI could you please tell me the way to plug off the heater core,I see two hoses in that area. one comes out of water pump , The other one go up to the intake manifold witch one should I plug off. the one coming out of water pump goes into the heater core the one coming back from core goes up to the intake manifold. what do you think,where should the shut off go. Rich outtt. THXXXXX.