Discussion in 'Peugeot 406' started by MIKE ROCHE, Sep 20, 2003.


    MIKE ROCHE Guest

    I have noticed that my temp gauge that use to run at just below 80 all the
    time now registers between 80 and just over 90 when the engine is working
    hard i.e. going up hills.
    I wondered if the airflow could be a problem so took a look at the fans. The
    temp quickly restores to below 80 after the fan has been working for a few
    minutes.The passenger fan seems to work when the engine temp goes over 85
    but not the drivers side one does not seem to come on.
    I have 2 questions
    1) Where are the fan relays located ?
    2) What is the sequence of operation for these two fans as I can find no
    switches on the radiator to switch them on and I suspect they may be
    controlled from the engine ECU
    MIKE ROCHE, Sep 20, 2003

    DervMan Guest

    The above behaviour sounds normal, especially when you have multiple fans.
    It'll run one or two, perhaps at different speeds, when it needs to. It's
    also perfectly normal for the engine to warm up when you're working it
    harder - but it's not overheating unless the coolant temperature extends
    into the red (which will be at least 100°C, probably more).
    More than likely, they're controlled by the ECU. I don't know the sequence
    for the 406, but does a fan run with the air conditioning switched on? On
    every air conditioning car I've encountered, it's normal for the fan to be
    running when you use the air conditioner, since the condenser needs to be
    kept cool.
    DervMan, Sep 21, 2003

    MIKE ROCHE Guest

    The climate control is switched to AUTO all the time and this uses the
    aircon when required to maintain the temperature at 22 deg C. The fan
    however only comes on when the engine temperature rises.
    I guess the operation is probably normal I am just curious about the fans
    working points and where the relays are located . I have had the car 4 years
    but only recently noticed the rise in engine temperature to 90 deg C.
    MIKE ROCHE, Sep 21, 2003
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