How do you change a radiator heatter on the VW Polo?

To change a radiator heater on a VW Polo, first, ensure the engine is cool and disconnect the battery. Drain the cooling system, then remove the dashboard and any necessary trim to access the heater core. Disconnect the hoses and electrical connections from the heater core, remove the old unit, and install the new heater core by reversing the steps. Finally, refill the cooling system, reconnect the battery, and check for leaks.