How do you change a heater matrix on frintera b 03plate?

To change the heater matrix on a 2003 Frontera B, start by disconnecting the battery and draining the coolant. Remove the dashboard and center console to access the heater matrix, then disconnect the hoses and any electrical connections. Take out the old heater matrix and install the new one, ensuring all connections are secure. Finally, reassemble the dashboard, refill the coolant, and reconnect the battery.