How to Bleed Air When Replacing Coolant in BMW B48?

1 Answers
AdrianaMarie
07/30/25 9:00am
Here are the specific steps to bleed air when replacing coolant in BMW B48: 1. Turn on the ignition without starting the engine. 2. Set the air conditioning system to the highest temperature and the blower to the lowest setting. 3. Fully depress the accelerator pedal for about 10 seconds. At this point, the electric water pump will activate and begin the bleeding process, and you can observe the coolant circulating in the expansion tank. 4. Wait for 3-5 minutes to ensure all air is completely expelled. Note: Another method for bleeding coolant is to disconnect the engine coolant temperature sensor. When the ECU receives no coolant temperature signal, it defaults to high-temperature mode, and the electric water pump will also perform the bleeding operation.
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