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Old 04-03-2012, 08:28 PM   #5
jfoj
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Join Date: Nov 2009
Location: Fairfax, VA USA
Posts: 9,643
My Ride: '06 330CiC, '03 M5
Not sure on the "radiator", if it is near the lower hose, it may be the fan switch O-ring in the lower radiator hose. Part is not shown as serviceable, but if you check my signature below, I have the proper O-ring part number listed.

Easy fix and suggest it be performed for every cooling system repair on E46/E39 and any other similar car with this same fan switch.
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Solve your misfires, lean codes, rough idle - http://forum.e46fanatics.com/showthread.php?t=897616

Fuel pump failures - http://forum.e46fanatics.com/showthread.php?t=929501

Temp Info - http://forum.e46fanatics.com/showthread.php?t=964491

Hidden OBC Menu - Check Voltage, Temps, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

E46/E39 GM5 Door Lock Info - www.bmwgm5.com

Lower hose fan switch O-ring - BMW #13621743299
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