How do you remove the heater matrix on a Citroen Berlingo 1.9d?

To remove the heater matrix on a Citroën Berlingo 1.9d, first ensure the vehicle is cool and disconnect the battery. Drain the coolant from the system, then remove the dashboard and any necessary trim panels to access the heater unit. Disconnect the hoses connected to the heater matrix, unbolt the matrix from its housing, and carefully extract it. Reassemble in reverse order, ensuring all connections are secure.