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which hose is which


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How can I tell which of my heater hoses is the inlet and outlet? And I use the inlet hose for flushing, is this correct?

I know there's an easy way, but can't find it anywhere. Thanks.

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I see the two hoses, one goes to the water pump, the other comes out of the block and goes directly into the heater core. I'm guessing the one from the block to the core is the inlet. Is this correct?

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