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Hi, I am currently having problems with my 5 series diesel. The battery has been running flat overnight and I have found that there is a drain of 5-7 amps even after the interior lights etc have turned off. During the drain a fan can be heard running from the passenger wheel arch area.the fan stops if the bonnet/doors are slammed shut but can restarts if they are slammed again. Aquick search on google shows that this ia a fault other people have had but I canno find a sensible answer to the problem? Before I start stripping the wheel arch I was hoping one of you guys could point me in the right direction? I would assume that it is the heater fan running but I would have also assumed that the heater fan is situated behind the centre of the dash?? I have seen mention of an auxillary fan but am unsure what this is??

Any help will be greatly appreciated

Many thanks in advance Sam

 

[Deano16v]

id say it was the heater resistor. can you feel air coming out around the feet vents? if it is then the resistor is located on the drivers side and is fairly easy to get at. about 90 quid to change

 

[xXxStKxXx]

Could be anything,Mate I had the identical symptoms turned out to be the remote cable to my amplifiers.However I would suggest checking the door switches and boot switch first.Basically it looks like a push button-if its broken then it doesn't break the contact when the door or boot is closed so the car thinks its open constantly-On my car the alarm beeps twice for closed if it beeps four times when I press the button to lock then I know one of these switches isn't working.

 

[ak186]

almost sure its the hedgehog

my old 530d use to do it, ended up selling it in the end..

 

[Diablo944]

almost sure its the hedgehog

my old 530d use to sell it and i couldnt get to the botton of it so sold it!

eh? am I the only one who doesn't understand that answer?

 

[ak186]

sorted

 

[Ronnie]

As mentioned check for the blower operating slightly into the foot wells, common final stage resistor problem(hedgehog).

http://www.c3bmw.co.uk/page.asp?categoryID=322

 

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No still not sorted

Hi again. No, I have still to find the cause of the fault. The car has been ok for the past week but I am 100% sure that the fault will reoccur. After doing a few searches I am starting to think that the fault is related to the Webasto heater. Other people have had the same fault where the webasto heater/fan has been running constatntly or is triggered by openeing or closing a door/bonnet etc.

I am unable to find a sensible rectification other than to remove fuse 47 from the boot which I dont really want to do. Unfortunately I cannot get the noise to reoccur at present so it is difficult to diagnose without a bit of advice from you guys. Hope this rings a bell with some of you!!

I can get the noise to happen when the ignition is on and for short time after it is switched off. During this time I have completely removed the heater resistor (Hedgehog) but the noise is still there.

Anymore help would be great. I will keep going to the car today and will hopefully get the webasto to run again.

will let you know thanks again Sam

 

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Quick update. went out to the car again and got the noise to re-occur by openeing and closing the drivers door, I could feel cool air being pushed out the Webasto exhaust on the underside of the car (no diesel fumes and cool air only). I removed fuse 47 which has stopped the webasto heater from running just to ensure thet the battery no longer goes flat. Any ideas on a more permanent fix would be great.
also i have re-checked the current draw with fuse 47 removed and found that it is back to what it should be.

Thanks Sam

 

[Ronnie]

You could always disconnect the Webasto heater, otherwise get the fault codes read for the heating and body control module and see if there are any codes stored