How do you install heater core on 1994 jaguar xjs 6-cylinder?

To install the heater core on a 1994 Jaguar XJS 6-cylinder, first, disconnect the battery and drain the cooling system. Remove the dashboard and any components obstructing access to the heater core, including the heater box. Carefully remove the old heater core from the heater box and replace it with the new one, ensuring proper alignment. Finally, reassemble the dashboard and components, refill the cooling system, and reconnect the battery.