Thread: Coolant
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Old 11-28-2012, 08:05 PM   #9
OEM ///Member
Join Date: Nov 2009
Location: Fairfax, VA USA
Posts: 22,991
My Ride: 330CiC, M5, X5, E93
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.
Solve your misfires, lean codes, rough idle -

Fuel pump failures -

Temp Info -

Hidden OBC Menu - Check Voltage, Temp, Fuel Level -

E46/E39 GM5 Door Lock Info -

Lower hose temp switch O-ring - BMW #13621743299
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