How do you get rid of air lock in a vw passat cooling system?

To remove an air lock in a VW Passat cooling system, start by ensuring the engine is cool. Open the radiator cap and the expansion tank cap, then run the engine with the heater set to maximum. This allows any trapped air to escape; keep an eye on the coolant level and top it off if necessary. Once the engine reaches operating temperature and the thermostat opens, any air should be purged, allowing for proper coolant circulation. Finally, replace the caps securely.