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BMW 3-Series (E90 E92) Forum > BMW E90/E92/E93 3-series General Forums > General E90 Sedan / E91 Wagon / E92 Coupe / E93 Cabrio > Engine heating on my '07 328i / very loud fan?



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      08-12-2011, 01:12 AM   #23
UnknownSpiritX5
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Hmm...so now i'm a bit confused again. 50% say its normal, while the other 50% has thermostat issues. I guess I should just have it checked out at the dealer just in case.
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      09-17-2011, 05:49 PM   #24
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was it in fact the thermostat?

any feedback on this?

thanks.
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      09-17-2011, 06:19 PM   #25
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Usually after a nice hard run, one the internal fan and radio is off, you can hear the fan still running under the hood! I just give it a few minutes to cool down, and it's shuts off.
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      09-07-2012, 03:53 PM   #26
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Old but useful post. Not sure if you call it a whine. To me it sounded like a mini jet turbine. Also, I just had dealer recharge refrigerant noticed it was very loud afterward. Guess I assume AC runs louder when it's fully charged. I could hear it in the cabin and then when I got out with the engine on it was very loud.

Another thing I noticed when I start it up and AC on max fan is turned on a few seconds later, the RPMs shoot up significantly for about 10-15 seconds then drops (but noise is still loud and noticable). Once I turn off AC, it's "quiet" againl.
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      09-11-2012, 01:00 AM   #27
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I also had loud fan noise problem until BMW replaced my thermostat (part # 11537549476). My car no longer sound like a 747 taking off the run way.

I used the INPA software to discover the faulty thermostat code. I don't think it's something BMW will actively notify or replace for you if don't tell them about it. I had complaint about it before checking w/ INPA and they told me the noise is normal.
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      10-30-2014, 03:29 PM   #28
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Loud noise !!!

So I was driving home and got to a stop sign and heard a strange noise what kinda sounded like what a bad belt I guess would sound like, got quit as I came to a stop and loud when I hit the gas, I did have an injen intake put on not too long ago, should it be the cause, and one point when I pulled in the drive way and in park, the car felt as though it was going to stall a little shaky. for some reason I keep going back to it over heating because I had a car before with problems of over heating and then a blown head gasket. So I'm really cautious of my bmw, will the car tell me it's over heating or if the fan is not coming on, since I do not see a temp gage in my cluster..
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      10-30-2014, 03:30 PM   #29
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Sorry this was my first post so I'm sorry if there are other threads idk how to do this sh$t
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      04-29-2015, 10:50 AM   #30
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Fan at full speed, loud

Noisy fan running at full speed is not normal. Other possible root cause is related to error code P2185 Engine Coolant Temperature Sensor 2 Circuit High, this is for the Radiator outlet ECT sensor. I did have and intermittent problem with the fan running at full speed and the P2185 error code. The radiator outlet ECT sensor temp data is used among others by the engine computer to drive the electric fan. This error code is not related to the ECT sensor located under the intake manifold.The bad radiator outlet ECT sensor fail safe mode for the engine computer is to run the fan at high speed. The root cause was that the connector female plug for the ground wire was pushed inside the plastic connector body. It was not making contact and sometimes intermittent contact. The Solution was to put it back into place (the connector will be replaced soon).
Before changing the ECT sensors always check first the wires and connector for electrical continuity, second check the signal to confirm you are getting 5 volts at the connector positive cable. If continuity and voltages are good, check if the ECT sensor is good: check the sensor resistance at low temp and at high temp. If resistance values are not within the expected ranges replace the sensor. Then move to the next error code. One at at time.
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