CX thermo fans
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Thread: CX thermo fans

  1. #1
    Fellow Frogger! IE23's Avatar
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    Default CX thermo fans

    I have one fan working when normally both fans come on together.

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    Should I start with checking the fan first and then maybe relays?
    If the fan motor is dead what then?


    Adrian

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    Fellow Frogger! rmac's Avatar
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    Apparently it is not uncommon for the shaft to seize. Check to see if the fan will spin by hand. Getting the old one out to replace it might be a bit of a challenge if my effort with one of mine last year was anything to go by.
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  3. #3
    1000+ Posts Greg C's Avatar
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    Check the fans and work backwards. I have had to clean the connectors at the fans on more than one occasion. It would be very rare for a fan motor to die, but if so plenty of second hand ones available or of course CX Basis for a new one.
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  4. #4
    Fellow Frogger! IE23's Avatar
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    Its working again today. So must be poor wire connections.


    Adrian

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    Hello Adrian, First connect a wire directly from 12v + battery to the + pin of each fans, check if they are working or not or if working they are noisy or working good. If they are working go for relays. but I guess this is relay or fuse problem because in all two fan CXs if one of the fans damages the other one must working.

  6. #6
    Now go make me a sandwich Hotrodelectric's Avatar
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    Quote Originally Posted by IE23 View Post
    Its working again today. So must be poor wire connections.
    Don't assume too far, Adrian. A poor connection is just that- poor. Play with it a little and check to make sure the connection isn't arced, burned or otherwise compromised. What little movement that knocked it into a connection today can knock it out tomorrow.
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    Member Houtan's Avatar
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    Also check the thermo switch on the radiator and its connection.

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    Now go make me a sandwich Hotrodelectric's Avatar
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    Quote Originally Posted by Houtan View Post
    Also check the thermo switch on the radiator and its connection.
    Excellent point- thermo switches do get weak with long use.
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  9. #9
    Real cars have hydraulics DoubleChevron's Avatar
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    There's no simple fix for this one. A poor connection just about anywhere in a series/parallel setup like the CX will generally leave you with no low speed fans, and only one high speed fan (think about how a series circuit works). Check the series/parallel relay (yeah fun finding that, look for the relay with the chunkiest wiring). It'll be burnt and melted if the wiring is suspect due to the heat generated by the dodgy connection. The wiring down into the nose can also be full of rott ('cos this is a pommy car). The spade terminals at the fans will probably be full of corrosion too.

    On these pommy cars you really need to snip out every wiring connector and chase back up the harness for some shiny, - non rotten - wire, then solder in a new connector and wire. For the wiring connetors that are just there for ease of assembly, and don't actually allow anything to be unplugged. Best bet is to snip these out and solder the wires together.

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    this is playing up again, back to single fan. It's the plug for sure. I jiggled the plug and instant double fans back on again. The wires move about easily within the plug and the connection is weak. Any ideas where I can get a new 3 pin plug?
    CX thermo fans-image.jpgCX thermo fans-image.jpgCX thermo fans-image.jpg


    Adrian

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  11. #11
    Now go make me a sandwich Hotrodelectric's Avatar
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    Quote Originally Posted by IE23 View Post
    this is playing up again, back to single fan. It's the plug for sure. I jiggled the plug and instant double fans back on again. The wires move about easily within the plug and the connection is weak. Any ideas where I can get a new 3 pin plug?
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    Long shot is the dealer. If that's a Bosch sensor (likely is), you can also try a Mercedes, BMW, VW or Volvo dealer. Look through the parts books. A good quality aftermarket parts source may have a pigtail with leads already attached, too. Take your pics and match it up.
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    Too many posts! JohnW's Avatar
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    Quote Originally Posted by IE23 View Post
    this is playing up again, back to single fan. It's the plug for sure. I jiggled the plug and instant double fans back on again. The wires move about easily within the plug and the connection is weak. Any ideas where I can get a new 3 pin plug?
    Click image for larger version. 

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    Couldn't you just bypass that plug by fitting female spade terminals to the three wires and going directly to the male spades on the switch?
    JohnW

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    1000+ Posts Greg C's Avatar
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    Quote Originally Posted by JohnW View Post
    Couldn't you just bypass that plug by fitting female spade terminals to the three wires and going directly to the male spades on the switch?
    My thought too but why not try some electrical contact cleaner like Servisol and give them a good clean, then with some needle nose pliers nip the corners of the plugs in the sockets and then refit. I can see some oxidation on on the the plugs that needs cleaning off.
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  14. #14
    Now go make me a sandwich Hotrodelectric's Avatar
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    Quote Originally Posted by JohnW View Post
    Couldn't you just bypass that plug by fitting female spade terminals to the three wires and going directly to the male spades on the switch?
    I was thinking about that too, but I hesitated for a couple of reasons: 1) getting loose 6.3 spades of a good quality are not overly common or easy to get and 2) crimping can be a problem because of the amount of current you're passing. The crimps need to be tight and well made or you'll have the same problem or worse a year from now.

    Going your route isn't bad, but for a use like this I would strongly suggest the 6.3 spades that have the heat sealable wire end. You want the additional support strength and insulating properties. If a pigtail is found, use the heat sealable butt splices. A set of 3 is like 2.50. If you really want, I can post a few to you gratis.
    The measure of your character isn't what you do when people are watching- it's what you do when they aren't watching.

  15. #15
    WRB
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    Thanks for asking, I only have one fan working as well

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