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Removing Secondary Radiator Fan

Discussion in 'A4/S4 forum(B5 Chassis)' started by Dibbler, Mar 30, 2012.

  1. Dibbler
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    Dibbler New Member

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    Hi all,
    Had the air-con recharged today massive improvement and runs ice cold now .but noticed the secondary radiator fan didn't kick in,checked and it is seized solid ,was looking at removing it but couldn't find any guides ,is there an easy way to get to it or is it a full bumper off job ,any help appreciated.
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  2. mwarrey
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    mwarrey Member

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    Hi, had exactly the same issue on my A6 this week! Garage wanted £450 to replace the fan\labour\regas. Got a fan from GPC for £60 and changed it myself one evening in about 1 hour.

    The garage said they would need to strip the entire front end off, but after a few minutes searching the forums I found out that it could be done with everything in place. I did take some pics whilst I was doing it but haven't time to post them up. Basically you need to :-

    1. Remove the engine covers and air intake (including the small part attached to the front grill with 2 screws) Disconnect the fan (on the A6 it is plugged in under a plastic cover by the ABS pump). I also disconnected the battery to be sure
    2. The top part of the fan housing next to one of the 3 arms holding the motor in place has a small self tapping screw, remove this.
    3. The whole fan then needs to be rotated clockwise about 20 cms. This will release it from the housing.
    4. The fan can now be removed, it will come out, not easily as it will catch against lots of pipes, cables etc so you may have to remove a few things or tie them out of the way (The N75 is right in the way on the a6)
    5. I then cut the wiring off my old fan in order to remove it.
    6. Put in the new fan, again this is not easy and will require some more swearing and general cursing of Audi engineers! but eventually it will go back in.
    7. I rerouted the cable along the top of the engine bay rather than its original route, and left the old cable in place, This makes the job a bit easier as I was short on time. I will revisit it at a later date when I have more time.
    8. The aux\secondary fan should come on as soon as as the aircon is on so you should see it working straight away.

    Good luck
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  3. Dibbler
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    Dibbler New Member

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    Thank you ,off to the breakers tomorrow to see if any fans are worth bothering with otherwise will order a new fan
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  4. mwarrey
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    mwarrey Member

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    I did think of a s\h one but they seem to be a common failure. I was quoted £170 by the garage for a genuine new one. There were a couple on ebay going for around £50 then I saw this new one for £45 :-

    AUDI A4 VW PASSAT AUDI A6 AUDI A8 RAD FAN 8D0959455C | eBay

    This would have fitted my car but I would have had to change the electrical connector. As I was short on time I paid a bit little for the correct one for the A6. This may be the correct one for a B5 give them a call (have your chassis no ready) they seem to know their Audi's.

    I have also just found this guide which shows you how to repair the fan. Seems like the failure is down brush tension failure which can be possibly fixed.

    A4 radiator fan removal and replacement - TDIClub Forums
    Last edited: Mar 31, 2012
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  5. mwarrey
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    mwarrey Member

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    Ok, just a quick update. Stripped my old fan down tonight using the guide below:-

    A4 radiator fan removal and replacement - TDIClub Forums[/QUOTE]

    my fan was a different to the one in the pictures but similar enough to follow. The brushes were worn but a bit sticky in their guides. I cleaned out all the dust and cleaned the commutator with some electrical spray. Re-assembled it and it works! Took about 15 mins. Shame you can't buy the carbon brushes on their own, anyone know of a supplier?
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