1997 E39 523i - location of relays for pusher fan

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  1. 1997 E39 523i - location of relays for pusher fan 
    #1
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    millstream's Car Details
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    523i SE
    Year of Manufacture:
    1997
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    The A/C on my 1997 BMW 523i has stopped working (is blowing only warm air despite having been recharged) and my BMW main dealer told me the ‘pusher fan’ has packed up and needs replacing. True that the fan does not run when the A/C button is pressed with the engine running so he could have been right.

    Since it is an expensive job (about £500 parts and labour) to have the replacement done by the main dealer, I thought I would check first for alternative possibilities for the malfunction and found a tip on the internet to short the middle terminal with an outer terminal in the electrical connector for the coolant temperature sensor. I did that and lo and behold the fan ran at high speed on one of the outer terminals. However, it did not run when I shorted to the other outer terminal (which I assume is for the low speed).

    So I conclude that the fan hasn't 'packed up' and runs OK but it's just that the low speed relay is faulty. Am I right? My problem now is that I can’t find the location of the auxiliary fan relays so I can’t do a final confirmation by swapping the low speed relay with the high speed relay as the tip suggested. Can anyone tell me how to get to the two relays, please?

    So far, I haven't been able to find a supplier of replacement relays for the fan. Any suggestions anyone?

     
     

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    Dr of BMW gildersol's Avatar
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    They're in the auxiliary relay box in the engine compartment. There's about 3 relays in there, two of which are the fan ones
     
     

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    Ronnie's Car Details
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    millstream's Car Details
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    523i SE
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    Many thanks. But how do I get to the auxilliary relay box? Is it under the microfilter housing in the engine compartment and if so how do I remove the housing? I am not very good at car DIY and have no manual to help. Grateful for any guidance.
     
     

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    Dr of BMW gildersol's Avatar
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    I'm not sure (got the info from the wiring diagram) This may be it, so apologies if it's not
    Attached Images
     
     

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    millstream's Car Details
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    Thanks for your help but that's one for an E34 model whereas mine is an E39 523i. The relay box is not in that location under the bonnet of my car. Can you help with a picture for an E39? Or just a description of where the box is and how to get to it. I just want to check if the low speed pusher fan relay is functioning OK or not (all the fuses are OK). If the relay is working, I think the next suspect is the coolant temperature sensor but would be grateful for anyone's advice on that.
     
     

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    Dr of BMW gildersol's Avatar
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    DOH. I didn't look properly and I'm not great at what's what with the 5 series
    The E39 fan looks to have 3 stages possibly. Take a look at these pics and see if they help.
    Stage 1 relay-K21 triggered by temp switch pin 3 or signal from A/C control unit black/red wire
    Stage 2 relay-K22 triggered by air con high press. switch
    Stage 3 relay-K201 triggered by temp switch pin 5 black/grey wire
    Attached Images
     
     

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    andriusv's Car Details
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    anyone knows the location fan relays for E46?
     
     

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