Thread: coolant leak?
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Old 08-10-2012, 09:58 PM   #4
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Join Date: Nov 2009
Location: Fairfax, VA USA
Posts: 16,118
My Ride: 330CiC, M5, X5
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.
Solve your misfires, lean codes, rough idle -

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Lower hose temp switch O-ring - BMW #13621743299
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