How to exhaust the BMW 5 Series when replacing the warm water valve?

BMW 5 Series replaces the warm water valve and exhausts as follows.

1. After filling antifreeze, the water tank cover remains open, the key is inserted, the ignition switch is turned on, and the engine does not start.

2. Adjust the air conditioning warm air mode temperature to the highest, the air volume to the minimum, and turn on the running lights, that is, turn the headlight switch to the right by one gear.

3. Press the accelerator to the end for about 10 second, which can be completed.