I had to top off coolant a few times( over a couple days) maybe a few ounces, after changing all my hoses. I changed my fan clutch since it was leaking oil onto the fan and after doing so I noticed the butterfly vents on the electric fan shroud would open at idle partially.

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2004 X5 3.0 Auto 140k
2005 325xi Auto 108k
1988 325ix 5spd 279k