How do you change the thermostat on a 2.0 beetle?

To change the thermostat on a 2.0 Beetle, first ensure the engine is cool, then disconnect the battery. Remove the engine cover and locate the thermostat housing, typically near the engine block. Detach the hoses connected to the housing, unbolt it, and take out the old thermostat. Install the new thermostat, reattach the housing and hoses, and finally reconnect the battery.