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To change the heater core in a 1998 Cadillac Eldorado, start by disconnecting the battery and draining the coolant. Remove the dashboard and the center console to access the heater core, which is located behind the firewall. Disconnect the hoses attached to the heater core, remove any retaining screws or clips, and carefully extract the old core. Install the new heater core by reversing the disassembly steps, ensuring all connections are secure, then refill the coolant and reconnect the battery.

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1w ago

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