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General E46 Forum
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Old 06-04-2016, 03:34 AM   #1
Richard57
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Join Date: Jun 2016
Location: Wiltshire
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My Ride: E46 320i
320i electric fan

Morning all,

I have a suspicion that my electric fan is u/s. I have just bought the Carly OBD plug and app and monitoried the coolant temperature yesterday on a 10 mile journey. On return home the coolant temperature continued to climb but the fan did not cut in. I checked some fora and learned that the fan should run for 20 seconds on start up. Mine does not. I removed the electrical connection from the temperature sensor and again the fan did not start. At all times, the temperature gauge needle remains in the vertical position.

I don't want to buy a new fan without being sure that there is not a simple test that I missed.

Can anybody offer any advice or ideas?
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Old 06-04-2016, 07:57 AM   #2
markusmarkus
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Read this: https://drive.google.com/file/d/0B59...VlE/view?pli=1

It's considered the authoritative pub on the electric fans.
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Old 06-04-2016, 08:18 AM   #3
Richard57
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My Ride: E46 320i
Thanks will read this with interest.

I conducted another test this morning and established that the fan is working OK but does not cut in until the coolant temp reaches approx 80 degrees C. As an aside, when I disconnected the electrical supply to the coolant temperature sensor, the temperature setting defaulted to -48 degrees. I have seen other posts that suggest it defaults to a maximimum whereas mine seemed to default to a minimum.
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Old 06-05-2016, 07:04 AM   #4
markusmarkus
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80*C is actually a very low temperature for the fan to run. It shouldn't kick in until the temp is over 100*C or if the AC is on. How are you determining the coolant temp? Goggle "BMW E46 hidden OBC functions." Test #7 will show the temperature of the coolant as seen by the ECU. Also, the temp sensor in the lower radiator hose is one of the factors used by the ECU to determine when to turn on the fan.
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Old 06-05-2016, 07:19 AM   #5
Richard57
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Hi Markus,

Thanks for your message. I have a German made http://www.mycarly.com/product/bmw-app/
That allows one to monitor a variety of parameters within the ECU. The 80 degree figure is taken from the temperature sensor on the lower radiator hose
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Old 06-06-2016, 06:09 AM   #6
markusmarkus
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Hmmmm. Ok, Google "BMW e46 hidden OBC functions." Test #7 will show you the coolant temperature as seen by the ECU. 80*C at the lower radiator hose sensor may not be too low for the fan to come on!!
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Old 06-06-2016, 01:25 PM   #7
Richard57
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Thanks. Have run both tests at the same time and there is a small difference between the 2. Not much, but in the order of 3 degrees.
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