another AC problem, Fan spontaneously turns on randomly | FerrariChat
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another AC problem, Fan spontaneously turns on randomly

Discussion in '348/355' started by potxoli, Jul 6, 2008.

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  1. potxoli

    potxoli Formula 3

    Mar 22, 2007
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    Washington DC
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    Eric B.
    #1 potxoli, Jul 6, 2008
    The fan in my car turns on randomly on full setting. This tends to happen more when the car is cold, at the beginning of a drive. Typical symptoms are, turn key to start, fan kicks in. Drive for 5-10 minutes, fan shuts off, then back on intermittently. Another 5-10 minutes later, it turns off for good. Basically it is possessed. It will turn on/off even at a red light, so it is not a bump or vibration that is causing this.

    I've checked and used stabilant on the ground tabs under the left vent, on the plug to the main AC controller itself. I've disassembled the main AC controller to check the solder joints and put stabilant on the pins. I've also checked the hiden fuse near the ABS ECU. If I take the fuse out, fan shuts off for good as does the AC display. None of these helped the problem.

    When I'm not experiencing the problem, The actual AC control seems to work fine. Clock works, if I hit the AC button, cold air comes out, heater works. Fan speed buttons work etc.

    Any suggestions?
     
  2. modena2904

    modena2904 Formula Junior
    Owner

    Jul 6, 2007
    917
    Ellicott City, MD
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    Eric
    #2 modena2904, Jul 8, 2008
  3. potxoli

    potxoli Formula 3

    Mar 22, 2007
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    Eric B.
    #3 potxoli, Jul 8, 2008
    Yes, I've run through all the obvious recommendations on the tech document. Hence checking and putting stabilant to the ground block behind the left vent, checking the fuse near the abs computer etc.

    Maybe I'm getting no responses because I stumped the brotherhood? :D
     
  4. kingsdare

    kingsdare Karting

    Oct 24, 2006
    132
    California
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    David King
    #4 kingsdare, Jul 8, 2008
    Sounds like the fan speed control unit.

    My fan would stay on medium speed even when the AC control was switched to vent. I could adjust the speed higher than medium, but it would never go below.

    Unfortunately it can't be repaired, just replaced. Ricambi has them and they aren't that expensive.

    I can send you my old one if you want to see if that changes your symptoms.
     
  5. fxdwgs

    fxdwgs Formula 3

    Aug 22, 2006
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    Bengt
    #5 fxdwgs, Jul 9, 2008
    Try to find one of my threads concerning A/C fan. Sorry I can not give you the thread here because I do not know how.
    The solution is there. I went through the same thing this spring.

    It is the fan motor itself.......easy fix......but some trouble getting the thing out.

    If you can´t find my thread..........give me a pm and I will guide you.

    Good luck!!!!

    //B//
     
  6. potxoli

    potxoli Formula 3

    Mar 22, 2007
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    #6 potxoli, Jul 9, 2008
    Is it this thread? http://www.ferrarichat.com/forum/showthread.php?t=197795

    I will try getting to the fan. The previous owner bolted a CD changer and amplifier against the carpetted trim so I'm going to have to disassemble all of that to get to the thing....
     
  7. potxoli

    potxoli Formula 3

    Mar 22, 2007
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    #7 potxoli, Jul 9, 2008
    Do you know the part number? I have such a hard time figuring it out on the ricambi site. thanks!
     
  8. fxdwgs

    fxdwgs Formula 3

    Aug 22, 2006
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    Bengt
    #8 fxdwgs, Jul 9, 2008
    If you make sure the fan is on........and wait till it turns off by itself.......then if you open up so you can see the fan itself........you press gentle on the centre of the fan.......the axle/shaft .......if it starts again it is the same problem I had.

    In that case take out the fan motor and change the coals and weld all them pressed copper wires. That is what the "doc" did with mine and now it works perfect.

    On the other hand the compressor stopped working the other day so I still have a problem.

    Never a dull moment!

    //B//
     
  9. kingsdare

    kingsdare Karting

    Oct 24, 2006
    132
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    David King
    #9 kingsdare, Jul 9, 2008
    The part number is 63307200 on Ricambi's site.
     
  10. potxoli

    potxoli Formula 3

    Mar 22, 2007
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    #10 potxoli, Jul 9, 2008
    Last edited by a moderator: Sep 7, 2017
    Thanks. Do you know where I can find this unit? in the diagram it just seems to hang out in space. Is it near the abs ecu? (Part 2 below for reference)
    Image Unavailable, Please Login
     
  11. kingsdare

    kingsdare Karting

    Oct 24, 2006
    132
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    David King
    #11 kingsdare, Jul 10, 2008
    Yep, that's it.

    Sorry for the late reply.
     
  12. potxoli

    potxoli Formula 3

    Mar 22, 2007
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    #12 potxoli, Jul 11, 2008
    No problem, thanks again. I'm going to try fxdwgs solution this weekend since its free, hopefully that is it, if not I'll order this part from daniel.
     

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