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To replace the heater core in a 2003 Ram Van, start by disconnecting the negative battery cable and draining the coolant from the radiator. Remove the dashboard and any necessary components to access the heater core, including the HVAC module. Disconnect the heater core hoses from the engine bay, remove the old heater core, and install the new one. Reverse the disassembly steps, refill the coolant, and check for leaks before reconnecting the battery.

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10mo ago

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