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  1. #1
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    ECU Cooling fan....

    I was cleaning out my glovebox and noticed the ecu cooling fan blowing constantly once the car was warmed up fully...Once I noticed this, the last few days I have been bugging out hearing the noise of the cooling fan from the ecu box, I guess its a selective hearing thing that I got going on! Anyway is the cooling fan from the ecu suppose to stay on constantly or is it suppose to intermittenly turn on and off...If its suppose to turn on and off, then I have a really issue and I am not bugging out...Can anyone tell me if your car is also doing the same...Thanks

    Its part number 5 on the diagram
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    I noticed the same thing with mine. I haven't heard it lately since the temps have started to drop.

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    I've noticed mine every once in a while, at least it's a constant noise, unlike the f-ing nav disk constantly seeking.

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    Yeah but is there a temp regulator that turns it on? Anyone?

  5. #5
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    Click here to enlarge Originally Posted by Cn555ic Click here to enlarge
    Yeah but is there a temp regulator that turns it on? Anyone?
    Try asking @Terry@BMS

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    0 out of 2 members liked this post. Yes Reputation No
    Wow. All these rebels on this forum and tech savvy gear heads and no one else has a clue. Forum doesn't get much helP here I see unless its a disgruntled post of somekindClick here to enlarge

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    The fan likely runs off a coolant temp sensor, I think it is located very close to the water pump. Also, is this with your A/C on or off? Having the A/C on always makes both fans turn on.

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    $#@! I didnt even know the ECU had a cooling fan and ive installed chips maybe 100 times minimum.
    Some people live long, meaningful lives.

    Other people eat shit and die.

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    Click here to enlarge

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    Mine broke down. I found out becaus of fault codes the JB4 gave me once installed.
    It looks like this:

    Click here to enlarge
    There are two theories to arguing with women. Neither one works

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    Wow, I just realized what fan you were talking about. disregard my responses, except for the first stating that I haven't heard mine running since I it cooled/took out my JB4 usb cable that ran through the glove box.

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    Click here to enlarge Originally Posted by DavidV Click here to enlarge
    Mine broke down. I found out becaus of fault codes the JB4 gave me once installed.
    It looks like this:

    http://www.bimmerboost.com/attachmen...3&d=1301420430
    Was It hard to change out?

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    Click here to enlarge Originally Posted by Cn555ic Click here to enlarge
    Was It hard to change out?
    I have a 135i, and in this model the fan iis located in the car behind the fusebox.
    It required disassembly of the right side and center column of the dashboard.
    In short, yes, it was a lot of work. Took a professional 3/4 hour.
    In a 335 the fan is located in the motorcompartment, and changing that is much easier. Just remove the DME box and you can reach it.

    Click here to enlarge Originally Posted by BoostAddict Click here to enlarge
    I haven't heard mine running since I it cooled/took out my JB4 usb cable that ran through the glove box.
    Check with the JB4 for code 2F71.
    If you have that code your fan is broken.
    There are two theories to arguing with women. Neither one works

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    Interesting...I need to read the codes and see if anything has popped up for me.

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    Click here to enlarge Originally Posted by DarkPhantom Click here to enlarge
    Interesting...I need to read the codes and see if anything has popped up for me.
    Mine is not broken but what I am asking is whether it shOuld stay on without shutting off.

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    I wonder if I can hook this thing up to my intake and have three turbos.
    Some people live long, meaningful lives.

    Other people eat shit and die.

    I'm not racist, I hate everybody equally; especially fat people.


    Click here to enlarge

  16. #16
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    Click here to enlarge Originally Posted by Cn555ic Click here to enlarge
    Mine is not broken but what I am asking is whether it shOuld stay on without shutting off.
    Does your car have any codes ?
    Is the fan sound noticable? Because it should not be. If it is audible, then perhaps something is malfunctioning i.e. the fan is spinning too fast, or a bearing has given up.
    There are two theories to arguing with women. Neither one works

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    Thats the thing its not loud but it noticeable when its on especially when the windows and radio is off...I am not the only only that hears this noise as other can too...It just kind of annoying when the radio is off and nothing else is turned on like the AC or just the fan for air...Seems over the top with this ecu cooling fan having to blast on just to cool the compartment...

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    Over the top, just like most of the BMW engineering. I've taken the ECU out after a drive before and it gets hot as a $#@!, so I can see why it needs a cooling fan being all cooped up in that plastic box. If were sitting out in the rain tray, it might have been okay without the fan, but then you couldn't hide the piggyback tuner!

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    Click here to enlarge Originally Posted by Cn555ic Click here to enlarge
    Wow. All these rebels on this forum and tech savvy gear heads and no one else has a clue. Forum doesn't get much helP here I see unless its a disgruntled post of somekindClick here to enlarge
    That's not true at all there are just some questions that are more difficult to answer. Trying to help you here...

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    Click here to enlarge Originally Posted by Ryan Mills Click here to enlarge
    Over the top, just like most of the BMW engineering. I've taken the ECU out after a drive before and it gets hot as a $#@!, so I can see why it needs a cooling fan being all cooped up in that plastic box. If were sitting out in the rain tray, it might have been okay without the fan, but then you couldn't hide the piggyback tuner!
    You know I have taken the ecu out also and your right it was pretty hot so I guess it's normal then. Just bugging out I guess

  21. #21
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    never heard the one in my E39 M5 in the winter... only in summer-time, and then it was constant...
    Click here to enlarge

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