How do you replace heater core on a 1988 Buick park avenue?

To replace the heater core in a 1988 Buick Park Avenue, start by disconnecting the battery and draining the coolant. Remove the dashboard and the center console to access the heater core housing. Disconnect the heater core hoses from the engine bay, then remove the heater core from its housing. Install the new heater core by reversing the disassembly steps, ensuring all connections are secure before refilling the coolant and reconnecting the battery.