How do you change the thermostat on a 2002 Volkswagen Cabrio?

To change the thermostat on a 2002 Volkswagen Cabrio, first, ensure the engine is cool and disconnect the negative battery cable. Drain the coolant from the radiator, then remove the upper radiator hose and the thermostat housing, which is typically secured by bolts. Replace the old thermostat with a new one, ensuring the gasket is in place, and reassemble everything by reversing the disassembly steps. Finally, refill the coolant and check for leaks before starting the engine.