Ha-ha. I thought this was a problem as well. I heard a surging sound coming from the car when the fan was blowing. Took it to my Bimmer tech and he said it is totally normal. He did add, now if you hear the noise when the fan isn't on...there is a problem.

So, you're fine.

__________________

An unwavering defender of those I see worth protecting.

"promote the general welfare, not provide the general welfare"

We the People of the United States, in Order to form a more perfect Union, establish Justice, insure domestic Tranquility, provide for the common defence, promote the general Welfare, and secure the Blessings of Liberty to ourselves and our Posterity, do ordain and establish this Constitution for the United States of America.