How do you change 1995 Volkswagen cabrio thermostat?

To change the thermostat on a 1995 Volkswagen Cabrio, first, ensure the engine is cool and disconnect the negative battery cable. Drain the coolant and remove the upper radiator hose connected to the thermostat housing. Unbolt the thermostat housing, replace the old thermostat with a new one (ensuring it's oriented correctly), and reassemble the housing and hose. Refill the coolant, reconnect the battery, and check for leaks after starting the engine.