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Thread: Fan Control Unit (design flaw?)

  
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    Fan Control Unit (design flaw?)

    Hello All,

    I'm not sure if this thread fits the general or the technical section of the forum, but here you go.

    The engine cooling light was playing up a while ago, and a little later I noticed that the fans would kick in and turn off after 1-2 seconds (regardless of the egine running or not) in 5-6 seconds intervals.

    Had the car checked, the mechanic said, "the fan control unit is faulty and loom has contaminated/corroded contacts". After a new control unit and a good clean on the connector plug, everything was perfect. Until it rainned...

    It turns out that there is a design flaw (the mechanic claimed) with the connector and water managed to get in, mess up the unit and damage the contacts on the plug.

    The remedy: new, complete, engine loom (quoted a figure around £350 to £500+vat for the part and 6 hours labour - not vauxhall dealer)!

    Just spoke to the vauxhall dealer who confirmed an unexpected number of occurences of the fan control unit problem, but Vauxhall hasn't officially recognised this as a design flaw. His recommendation was to go to the scrapy and find an engine loom.

    1. Has anyone here been faced with the same problem?
    2. The engine cooling light is constantly on now, but the car runs fine without any other issues. Would that be an MOT failure?
    3. Would any nagging to Vauxhall CS help at all? (if it's an MOT failure there isn't much time to react as I really need the car on the road).

    For the record, I'm talking about an ASTRA LS 1.6 16v (XE16XEL), T reg (1999), Mk4.

    Sorry for the length of the post.

    Cheers,
    Kakourdos
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  2. #2
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    Never had that problem....mines the same year and engine.

    Can you not just clean the terminals up again and seal the connector ?

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    yes mate on both my astra's had a new colling module recently and still happens.
    Its because of were the cooling module is, right buy the front wheel behind the arch liner passenger side.
    A meme was sent around the AA about this fault too

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    my control units was replaced when it was a year old under warrenty.
    the fans would come on and off when they wanted!!
    Astra '01 1.8 SXI - 19's, Koni's, Irmscher everything! *SOLD*
    BMW '04 325 Sport

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    Hello,

    I am thinking of getting a loom from the scrapy, cut about 50cm from the connector, clean it up and splice it with the existing loom.

    I've got all the tools I need, apart from heat-shrink insulator bits, that I could get from maplin or something. With respect to cut/paste cabling it shouldn't be too much of a job really.

    I have planned the job as follows (I haven't done anything major in the past, involving battery disconnection, so feel free to fill in the gaps, even small details that may be implied):

    1. Turn Key to position II (if I'm not wrong) and disconnect the battery.
    2. Cut the donor loom to expose wiring.
    3. Cut existing loom to expose wiring.
    4. Splice the exposed wires and insulate using heat shrink insulation.
    5. Insulate the overall splicing area.
    6. Connect the battery (and watch car explode?)
    7. Attempt engine start (if the car still intact)
    8. If car's fine, go to pub.
    else, scrap it and buy a new one.

    Problem is, the MOT is really soon and I'm not sure if I will have the time to sort it out. The weather isn't helping either .


    Cheers,
    Kakourdos
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    While at Courtenays yesterday, this was mentioned. They have replaced a few that have gone like this. It may be worth protecting them in some way as they are a little vunerable where they are TBH.
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    Yes, the poor thing is pretty much exposed... They could have put a bit of plastic cover I suppose...

    Anyway...
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    mine used to do exactly the same thinking about although I never saw it as a problem. It did however come on and off when it felt like it for short periods of time just like yours does.

    I dont have the problem know though as the fans are on a switch for my current set up. If you are going to do the above to fix it, could you do a 'how to' for the site as its quite apparent its a problematic area and many would benifit from an easy fix rather than pay £500+

    I hope it works ok for you and keep us posted
    Been apart of the inner circle since 2001
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    Hello All,

    I will compile a 'How To' indeed.

    Can someone clarify if the constant-on engine cooling light would be a MOT failure?


    Cheers,
    Kakourdos
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    Fan Control Unit (progress)

    Hello All,

    1. Found the haynes manual under a stack of old magazines.
    2. Found a donor astra, same year engine spec etc. and the kind people at the scrapy circurmsised the engine loom.
    3. Got my polymeter, soldering iron, and the rest of the bits in place.
    4. Turn to page 12*35 of Haynes manual (Astra 1998 On - Diagram 10)
    5. Scratching head for a day now...

    My trouble is that the wire colours on the donor plug a "slightly" different from the ones mentioned in Haynes. Also the total number is again different.
    All this may be resolved as soon I have a proper look at the plug on my car.

    Anyone on the effect on the engine cooling light being on during the MOT???

    Cheers,
    Kakourdos
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