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Old 04-03-2012, 09:28 PM   #5
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Join Date: Nov 2009
Location: Fairfax, VA USA
Posts: 16,585
My Ride: 330CiC, M5, X5
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.
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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