I have a E70 2007 X5 4.8i. Last week I replace my Coolant Sensor and while doing that lost 1/4G of Antifreeze. I look at the coolant expansion tank and see coolant below Min. So I add 1/4G of BMW 50/50 coolant and bring to Max marker. Is their a special procedure to add coolant like making sure air is pushed out or just pouring it will do it. I believe I don't have Electric water pump but not sure of that. I have read that with electric water pump their is a certain sequence need to be followed to pump out any air bubbles..