Thread: coolant leak?
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Old 08-10-2012, 10:58 PM   #4
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Join Date: Nov 2009
Location: Fairfax, VA USA
Posts: 12,111
My Ride: '06 330CiC, '03 M5
Check the sensor in the lower radiator hose, the O-rings leak all the time.

If there is any moisture under the switch onto of the belly pan, your O-ring needs to be replaced.

See my signature below for the O-ring part number.
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Lower hose fan switch O-ring - BMW #13621743299
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