Thread: Coolant
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Old 11-28-2012, 07:05 PM   #9
jfoj
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Join Date: Nov 2009
Location: Fairfax, VA USA
Posts: 10,019
My Ride: '06 330CiC, '03 M5
Figure out which side of the car the leak is on.

Drivers side likely the expansion tank or something in that area.

Passenger side likely the fan switch in the lower radiator hose.

Make sure you look at the top of the lower engine cover and not just on the ground. The lower engine cover can catch and redirect any leaks.

Fan switch O-ring is a VERY common leak, cheap and easy to fix. Part number in my signature.
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E46/E39 GM5 Door Lock Info - www.bmwgm5.com

Lower hose fan switch O-ring - BMW #13621743299
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