How to Burp trapped air from BMW Cooling System/Water Pump test

Any time work is done on the cooling system it needs to be Burped/Bled/purged. Air pockets need to be removed . Air pockets will cause expansion tank, water pump , hoses, radiator thermostat, heater core, and eventually engine to be all at risk if purging is not done properly. (Bmws with auxiliary waterpump only)

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