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Old 11-26-2016, 10:34 PM   #1
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Join Date: Oct 2014
Location: Somerset
Posts: 77
My Ride: 330i
E46 330i Engine Cooling Issue!

I've replaced the cooling fan and the coolant temp sensor. The fan seems to work most of the time but sometimes doesnt. Especailly when I am sitting on bumper to bumper traffic and when the engine temperature rises. What could be the problem?
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Old 11-27-2016, 08:20 AM   #2
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Join Date: Jul 2008
Location: USA
Posts: 6,171
My Ride: 2001 330Ci
What brand of electric cooling fan did you buy? The fan is controlled by the engine computer (ECU). The ECU uses the data from several sensors, including the one in the lower radiator hose, to determine when to turn the fan on.

Here's some good reading: https://drive.google.com/file/d/0B59...VlE/view?pli=1

Google "BMW E46 hidden OBC functions." Tests #7 will show you the temperature as seen by the ECU. It should remain in the 95*C to 100*C range. What's the condition of the cooling system? Has it been overhauled?
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