How do you change heating matrix on Vauxhall vectra?

To change the heating matrix on a Vauxhall Vectra, first, ensure the vehicle is turned off and the battery is disconnected. Remove the dashboard and center console to access the heater unit, which typically involves removing screws and clips. Then, disconnect the hoses and electrical connections from the heating matrix, take out the old matrix, and replace it with the new one. Finally, reassemble the dashboard and reconnect the battery, ensuring there are no leaks in the system.