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      12-16-2009, 07:57 PM   #1
gumpy
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fan running or humming after shutting car off and won't stop

When I shut the car off and close the door, about 1 minute later there is a high pitched wine and this is immediately followed by a fan starting up or a humming. It is constant and will not shut off even after hours!!! It sounds like it is coming from under the plastic engine cover. As soon as you unlock the doors, it shuts off for 1 to 2 minutes and then the fan noise starts back up again and won't shut off. I have a BT tool and checked all fault codes, even in the electronics and no fault codes.


Anybody know what it is?

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      12-16-2009, 09:20 PM   #2
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the car is supposed to do that when it is over a certain temperature at shutdown. i live in texas, and my car, my girls S4, and her sisters RX8 all do it all the time after you shut the car off

something may be wrong with a sensor if it is doing it at this time a year though. cant imagine the engine getting that hot unless your driving it for a while
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      12-18-2009, 07:29 PM   #3
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It was 27 degrees out when it happened. I took the JB+ out and it seems to have gone away. Will leave it out a couple of days and see if there is any more issues. I may have gotten a bad JB+
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      12-20-2009, 07:38 PM   #4
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I e-mailed Terry at Burger Motorsports and he does not think that the JB+ is causing the problem, however, the fan or pump only runs when the JB+ is installed. Anybody else have any issues like this with or without the JB+ installed.
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      12-22-2009, 08:29 AM   #5
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I would not think the JB+ would be the cause of the issue. But, if the issue has stopped once you remove the JD+ and comes back when you connect the JB+ back up, then it has the be the JB+. Are you sure it is connected up correctly.
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      12-23-2009, 07:36 PM   #6
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Well so much for that theory. Went a week stock and then the fan / pump came back on!! Called the dealer and am going to get it looked at next week. The dealer said based on symptoms it could be the emissions air pump. Will let everyone know after next week.
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      12-27-2009, 07:47 PM   #7
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I got the same humming and it took my battery out. Taking it in...
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      12-27-2009, 08:46 PM   #8
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Sounds to me like your turbo is cooling down.....

I had the same thing happen to my volvo turbo
but this shouldnt happen on a bmw
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      12-28-2009, 06:09 PM   #9
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Trillon,

Let me know what you dealer finds out. My appoint is for Jan 5th, so I won't know until then.

Does yours do it very intermittently? Mine will go for about a week after putting the car to sleep. It has gone almost 2 weeks now. If it does it next time, just put your hood up and lock the doors, it will put the car to sleep in 20 minutes and the fan will stop.
This will save your battery.

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      12-28-2009, 07:12 PM   #10
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I had an e36 that had the relay controlling this fan fail in the ON position. That fan would run always.

I only discovered it when the car's battery would go flat if left along for 2 days. Long enough for that fan to discharge it fully.
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      01-06-2010, 07:48 PM   #11
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Had the car in for service. Showed the mechanic and service manager a video of the noise. Had to video it, as it is so sporadic. They could not figure out what it could be in the area under the plastic engine cover. We took the engine cover off and looked at what is under there. The only thing that has a relay under there is the Vanos solenoid, but that would click if it went bad, not hum. They are thinking it might be the water pump running, but that is way down towards the bottom of the car. The mechanic told me to open the coolant cap and watch for swirling in the tank when the car is off. If I see swirling when the car is off and it is making that noise, it is likely the water pump. He noted that it could also be a resonant noise from something vibrating in the engine compartment. He told me to try to put my hand on various hoses and engine parts to see if it stops. So really no solid answer at this time.

Anyone else have an update on this after going to the dealer.

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      01-10-2010, 02:01 PM   #12
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Gumpy

the water pump was staying on all all times. They did a check on the electrical system to make sure is was all correct. They replace the pump close to$600 without labor. They took the water pump apart because he could believe that would go so fast. The pump looked all messed up inside. I have been using the car since the first with no problem.
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      01-10-2010, 08:33 PM   #13
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Trillion,

Thanks for the update. I'm glad they were able to fix it on your car. It think this is what is happening on my car. Did your fan or humming noise start out sporadic and then eventually happen all the time?

Here is a link on youtube with my noise. Does it sound the same as yours?



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      01-10-2010, 09:50 PM   #14
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I had heard the noise once first a few min about a month ago; then I heard it one other time but when i went to get the car it was completely dead. I jumped started the car and all kind of light came on, I cleared all lights and shut the car off but the noise wouldn't stop and drained the battery off again. Dan from Sitkos repair is excellent in Yarley PA in computer diagnostics for all euro cars. and he had seen electric water pumps stayed on at all time before.

I would get BMW to replace that pump if the car is under warranty. Dan predicted this issue was going to be common because he is perplex at how worned the pumped looked pretty much saying the pumps have crapy craftmanship. What is the water temp on your car when driving? he said my pump was destroyed inside, maybe your is starting to go. But be very firm about that with BMW cause theay are jerks about fixing stuff.
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      01-10-2010, 09:56 PM   #15
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My dealer is great about fixing things. At least I have it logged as a compliant before my warranty runs out.

Did you listen to the noise on my youtube video?

Did it sound like your noise when you 1st heard it before the battery totally died?

I will have to use my BT tool to check my water pump temperature, as the car's guages only show oil temperature. I got BMW to get me an oil cooler installed. Oil temps are fine.

Thanks for your help.
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      01-11-2010, 08:51 PM   #16
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Anybody else listen to the sound on the video and know what it is?

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      02-17-2010, 08:25 PM   #17
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I had the exact same noise, noticed it today after I shut off the car. Decided to lift the hood and wait....after about 3 min., it was gone. Could it be coolant related? What about the rest function with the heater??
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      02-19-2010, 09:54 PM   #18
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It has been about a month now and the noise has not re-appeared. I don't understand it. Hope it never comes back. It is not the rest function with the heater, as it makes a different sound and I had it off when I shot the video.

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      02-24-2010, 11:05 PM   #19
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It is probably your electric fan. Eventually if you dont drive your car for a few days this can drain your battery. Only some mechanics know about this. No guarantee this is the problem but you can mention this.
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      03-16-2010, 09:16 PM   #20
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I checked and no radiator fans were running when this noise was present.

It still has not returned. Knock on wood!!!!!

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      11-13-2014, 12:22 PM   #21
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Quote:
Originally Posted by gumpy View Post
Trillion,

Thanks for the update. I'm glad they were able to fix it on your car. It think this is what is happening on my car. Did your fan or humming noise start out sporadic and then eventually happen all the time?

Here is a link on youtube with my noise. Does it sound the same as yours?



Gumpy.
Gumpy, did you figure this out. Had it happened again? I'm facing the EXACT same issue, DITTO! Took it a few mechanics and no one seems to know.

Last edited by hunnypuppy; 11-13-2014 at 01:15 PM.
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      12-10-2014, 08:04 PM   #22
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I put my jb4 into off mode (map 0) and the noises stopped. Anyone else ?
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