2002 e39 ,fan coming on when ignition off causing flat battery?

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  1. 2002 e39 ,fan coming on when ignition off causing flat battery? 
    #1
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    podmo's Car Details
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    hi all, i have as 2002 e39 520 , i have this problem which has just started, every now and then when im driving this fan comes on from behind the dashboard, im sure its not the main heater fan, also when i come to a stop this fan comes on again , it last for about 5 seconds then turns off then it will do this every few mins till the battery goes dead? this happens with the key out and the main heater blower turned off, its got me baffled so any advice would be fantastic folks
     
     

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    On my 120d 2004 I have the"REST" option on the drivers side blower control.

    It comes on when the engine is off to heat the car when pressed of course.

    Have you got the same?
     
     

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    its not the final stage resister is it? any problems with your main blower/ pulsing?
     
     

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    Quote Originally Posted by tommos43 View Post
    On my 120d 2004 I have the"REST" option on the drivers side blower control.

    It comes on when the engine is off to heat the car when pressed of course.

    Have you got the same?
    yes i think i have the rest function, if thats the one thats let you put the heater on when the car is not running with the ignition off, its a funny one to solve as it does not seem to be the main fan, it just comes on for a few seconds every 2 mins or so, and its not warm air that it blows out, also it just blows out of the rear passenger vent. im perplexed :-(
     
     

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    Quote Originally Posted by vauxfan View Post
    its not the final stage resister is it? any problems with your main blower/ pulsing?
    hi there, the main blower works just fine, nice and hot , its only had this problem the past few days, this fan also i think will come on even when i have my heater set to on, it must be using a lot of power as it will drain my battery over night. am i right in thinking there are two blowers in the bmw, one for the heaters and another one that does something else?

    many thanks paul
     
     

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    I would put money on the Final Stage resistor. Easy to check. Find the plug that plugs into the final stage resistor and disconnect it. If your battery does not go flat, it is the resistor. There is plenty of information in the forum and outside to show you how to find it.

    This may be helpful as well

    http://www.bimmerforums.co.uk/forum/...common-t58436/
     
     

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    avneet07 (22-09-2011)

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    #7
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    Pickup a hedgehog (fs resistor) from Quarry Motors they are only £30 (ebay or phone them) - worth eliminating it eitherway.

    Mine had no issues with the blower but like yours battery was drained by the fan being on after the key was taken out of ignition
    Pain & Pleasure ....... my e39 ...... meJulie ..... what a car
     
     

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