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My air pump made that noise. I replaced it. The bearings were shot. Tried three of them. The last one is a Hella. The first two failed ECM checks.
The microswitches are available. I have a part number someone posted. I plan to buy two. I'll check my spreadsheet for a link to them.
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'06 X5 3.0i - bought @143,123 miles (12/26/20)
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