BX engine fan question
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  1. #1
    Fellow Frogger!
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    Default BX engine fan question

    What is the sequence for the engine fans on the BX? When I short out the terminals I get either 2 fans on low speed or the left hand fan on high speed. Is this correct? I was thinking that I might have 2 fans on high speed at some time
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    Michael
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  2. #2
    Fellow Frogger! Mungous's Avatar
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    Does/did your car have A/C? Switching that on should fire up one fan at full speed I think. Then hitting 97į or so should have both going full speed.

  3. #3
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    Used to have A/C, but have removed it all.

  4. #4
    sans witticism SLC206's Avatar
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    Yes, it's two fans at low speed or two fans at high speed.

    The problem you most likely having is that different relays are involved (three in total).

    This link may help, though it's in regard to a 306, which is a newer design than the BX.
    Regards,

    Simon

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  5. #5
    1000+ Posts Greg C's Avatar
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    As usual, the concept is the same but the 306 wiring (newer) is more complicated than on the BX. I would lay money on the crossover relay.
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  6. #6
    sans witticism SLC206's Avatar
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    That's interesting.

    I would have said the right hand fan relay (or connections to it) was suspect, based on the 306 diagrams, as the only time it's used is during high speed ops.

    That's only my guess though
    Regards,

    Simon

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  7. #7
    1000+ Posts Greg C's Avatar
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    Well there only two things to look for, you are probably right in that the crossover either connects one fan to the other or connect that fan contact to earth. Depends which fan is not working in high speed mode.
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  8. #8
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    The drivers side fan is not working on high speed; only the passenger side is on high. Both work on slow speed.

  9. #9
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    Default The fans

    Are connected in series for low speed ,[one after the other ]or in parallel for high ,has to be in the relays, pugs

  10. #10
    Fellow Frogger! Mungous's Avatar
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    Did you get to the bottom of this? I have finally replaced the faulty fan switch on my car and discovered that it behaves exactly the same (now that it is without AC).

    I have a feeling that this has something to do with the AC system being removed - with AC switched on, both low speed fans should go regardless of temperature. Once the high speed switch is triggered and the AC is on, both fans should be on high speed.

    However without AC on, both fans come on at low speed and, when temp goes up further, the LH fan kicks to high.

    Mine behaves as if the AC is switched off, and the Haynes Book of Lies doesn't have a wiring diagram that helps me understand how the relay is triggered by the AC system.

    Earthing both terminals of the fans simultaneously seems to get both fans going at full noise.

    Useful info here: http://citroen.tramontana.co.hu/cool...of-overheating

  11. #11
    Too many posts! JohnW's Avatar
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    Quote Originally Posted by michael16v View Post
    The drivers side fan is not working on high speed; only the passenger side is on high. Both work on slow speed.
    So both fans are OK. At low speed, are they not working in series, i.e. effectively on 6V? So they are not working in parallel, at high speed, at 12V each fan. Sounds like a relay doesn't it?
    JohnW

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  12. #12
    Fellow Frogger! Mungous's Avatar
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    Quote Originally Posted by JohnW View Post
    So both fans are OK. At low speed, are they not working in series, i.e. effectively on 6V? So they are not working in parallel, at high speed, at 12V each fan. Sounds like a relay doesn't it?
    Yes - when the switch (no.850 in the attached) activates at the first stage (or the AC is turned on - not shown in the diagram) a resistor is included in the circuit that activates the fan (no.788 in the attached). When the second stage kicks in, the relay bypasses the resistor and the fan gets 12v.

    But on cars with AC like Michael's and mine, there must be a separate feed from the AC to tell the RH fan relay to switch to high as well. If I can identify that feed and the correct relay, I should be able to add a feed that makes that relay think the AC is switched on and thus give both fans at full speed.


  13. #13
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  14. #14
    JBN
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    I don't have a BX manual anymore, but a question, does the BX have a Bitron? The Xantia does, and that works out the switching between AC (on/off), temperature and then selects which relays to energise to run the fans at low or high speed or not at all.


    John

  15. #15
    Fellow Frogger! Mungous's Avatar
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    Nope, no bitron switch. Just a regular 3-terminal temperature switch.

  16. #16
    1000+ Posts Greg C's Avatar
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    The resistor wiring is only for continental market cars. All cars sold here are 'Grande Exportation' spec and have the series/parallel fan setup.
    Mine

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