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There are two hoses coming from the engine that go to the heater core in the dash. One is a supply hose and the other is a return hose. You simply take these hoses loose where they enter the firewall and connect them together using a double hose barb with clamps. I think it's a 5/8ths barb that you need.

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15y ago
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Q: How do you by-pass the heater core on a 1997 Dodge Caravan?
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