406 HDi mystery noise
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  1. #1
    WLB
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    Default 406 HDi mystery noise

    My son rang me the other day to say that it sounded like there was a loose bit of plastic touching the radiator fan. He couldn't see anything through the grille. He rang back later to say when he started the car again it was no longer doing it.

    He was home yesterday and when he started the car to leave, the noise started. He had left the air-con switched on so as soon as he started the cold engine, the fan started. It sounded exactly like a strip of cardboard being struck by the fan blades. Looking through the grille with a good torch, I couldn't see anything. Nor could I see anything obvious under the bonnet. It sounds like it's coming from the bottom right-hand area of the radiator, when viewed from the front of the car, looking in through the grille.

    He turned off the air-con while I watched through the grille, and the sound stopped immediately despite the fan taking quite awhile to stop spinning. He then restarted the engine with the air-con off and as soon as the fan started so did the noise, but when the engine was turned off, the noise again stopped immediately despite the fan still freewheeling. 5 minutes later when he restarted the engine; no more sound.

    Does anyone have any ideas?

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  2. #2
    Contented Peugeot Driver addo's Avatar
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    Could a fan blade be loose on the motor shaft?

  3. #3
    WLB
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    Good point. Thanks Addo.

  4. #4
    Tadpole
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    They are a one piece cast plastic fan, held in with 3 bolts. No way for 'a blade to come loose', but the bolts can come loose or the thread socket can fall out or crack. I know they are a fuddle to get to, but first thing is check they are all in tight & that there is not more than normal play in the main bearing of the fan. Your problem will be one or other, bolts or bearings.
    Last edited by 405 SRTD Owner; 30th October 2015 at 06:30 PM.

  5. #5
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    I haven't needed to attack the 406 fans yet, but if they are the same as the 605 and Citroen Xantia (& it looks as if they are), the fan motor is held by 3 bolts - but the fan (and you are right - it is a one-piece fan) is held onto the shaft of the motor by a single small bolt (reverse thread).

    If that little bolt (usually has a Phillips-head top rather than hex) were loose, the fan could possibly move out enough to touch something .

    Cheers

    Alec

  6. #6
    Tadpole
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    The little bolt in the end never dislodges, being reverse thread. When the bearings start to go this will give enough play for the fan skirt ring to touch the cowling under thrust, & can be intermittent. My guess 90% this is the most likely issue.

    Sent from my HUAWEI Y520-U33 using Tapatalk

  7. #7
    WLB
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    Thanks. I'll have a closer look at it.
    It hasn't done it since.

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