How do you change the heater matrix on a peugeot expert?

To change the heater matrix on a Peugeot Expert, first, disconnect the battery and remove the dashboard and center console to access the heating system. Drain the coolant and detach the hoses connected to the heater matrix. Remove any screws or clips securing the matrix in place, then carefully extract it. Install the new matrix, reassemble the components in reverse order, and refill the coolant before reconnecting the battery.