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To replace the heater core on a 1990 Cadillac Brougham, start by disconnecting the battery and draining the coolant. Remove the dashboard and the center console to access the heater core, which is typically located behind the firewall. Disconnect the hoses and any electrical connections, then unbolt and remove the old heater core. Install the new heater core by reversing the disassembly steps, ensuring all connections are secure before refilling the coolant and reconnecting the battery.

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