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If you have not bled the system do so. Fill it up put on the cap start it up and let it run, turn on the heater and let it run until up to operating temp. Open the bleed screw. When only coolant comes out the system should be free of air. FYI-the expansion tank is not completely full when the system is at appropriate level.
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 X5 4.6 2002 Black Sap, Black interior. 2013 X5M Melbourne Red, Bamboo interior
Dallas
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