355 - the cabin blower turns on by itself at maximum speed when engine is running | FerrariChat
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355 the cabin blower turns on by itself at maximum speed when engine is running

Discussion in '348/355' started by evo11, Apr 30, 2023.

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  1. evo11

    evo11 Karting

    Sep 21, 2020
    188
    Full Name:
    K
    #1 evo11, Apr 30, 2023
    Hi Guys,

    I had the great pleasure of driving my wonderful f355 today.
    To my surprise, after starting the engine, the cabin fan turned on at stayed at highest speed. Nothing changes when adjusting the potentiometer. I stopped, turned off the engine and after a while I started again and the cabin airflow turned off and I could operate it normally by adjusting the potentiometer. Unfortunately when I was returning home it turned on again at the highest speed and did not respond to the potentiometer adjustment. Please help, where should I start?

    Thanks
    K

    Image Unavailable, Please Login
     
  2. lanab

    lanab Formula Junior

    Feb 21, 2016
    510
    Stockholm, Sweden
    #2 lanab, Apr 30, 2023
    I had the same problem and it's most probably the power transistor part 63307200
     

    Attached Files:

  3. evo11

    evo11 Karting

    Sep 21, 2020
    188
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    #3 evo11, Apr 30, 2023
    Thanks. Where it is located in the car?
     
  4. lanab

    lanab Formula Junior

    Feb 21, 2016
    510
    Stockholm, Sweden
    #4 lanab, May 1, 2023
  5. evo11

    evo11 Karting

    Sep 21, 2020
    188
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    #5 evo11, May 1, 2023
    thank you for the information. Where can I get to this? Need to remove the dashboard?
     
  6. lanab

    lanab Formula Junior

    Feb 21, 2016
    510
    Stockholm, Sweden
    #6 lanab, May 1, 2023
    From the left side in the luggage compartment, pretty much self explanatory in the pic above.
     
  7. Qavion

    Qavion F1 World Champ
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    Feb 20, 2015
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    Ian Riddell
    #7 Qavion, May 1, 2023
    You need to remove the forward luggage compartment liner. It's in the frunk.

    Also known as the fan speed regulator, power unit, hedgehog (on 360/430), etc...

    No longer available or vary rare. If you look a parts websites, they indicate this by quoting ridiculous prices e.g. $3,153.49 at Eurospares. Best bet is to repair it.

    https://www.ferrarichat.com/forum/posts/148363788/
     
  8. evo11

    evo11 Karting

    Sep 21, 2020
    188
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    #8 evo11, May 1, 2023
    Qavion likes this.
  9. evo11

    evo11 Karting

    Sep 21, 2020
    188
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    K
    #9 evo11, May 1, 2023
  10. lanab

    lanab Formula Junior

    Feb 21, 2016
    510
    Stockholm, Sweden
    #10 lanab, May 1, 2023
  11. evo11

    evo11 Karting

    Sep 21, 2020
    188
    Full Name:
    K
    #11 evo11, May 1, 2023
  12. evo11

    evo11 Karting

    Sep 21, 2020
    188
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    #12 evo11, May 1, 2023
    I have no idea how to pull it out. I tried to pull using pliers for the contacts but unfortunately it does not move...
     
  13. lanab

    lanab Formula Junior

    Feb 21, 2016
    510
    Stockholm, Sweden
    #13 lanab, May 1, 2023
    Pull what out? it's already pulled out above right?
     
  14. evo11

    evo11 Karting

    Sep 21, 2020
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    #14 evo11, May 1, 2023
    It's need to be removed for fixing?
     
  15. lanab

    lanab Formula Junior

    Feb 21, 2016
    510
    Stockholm, Sweden
    #15 lanab, May 1, 2023
    Just test it first, otherwise buy a new one, they are hard to find though...
     
  16. Qavion

    Qavion F1 World Champ
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    Feb 20, 2015
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    Ian Riddell
    #16 Qavion, May 1, 2023
  17. evo11

    evo11 Karting

    Sep 21, 2020
    188
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    #17 evo11, May 1, 2023
    So there's a chance it's working fine and that's not the cause of the problem??
     
  18. Qavion

    Qavion F1 World Champ
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    #18 Qavion, May 1, 2023
    The HVAC ECU is sending a control signal, so it's possible that that is faulty. @m.stojanovic has some tips on faultfinding.

    One of the repair shops, technozen-electronics.co.uk, has this warning:

     
  19. jjtjr

    jjtjr Formula Junior

    Aug 29, 2016
    756
    Vermont
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    john truskowski
    #19 jjtjr, May 1, 2023
    That's a nice watch and lexus brochure! :) I would definitely bench test that before ripping it apart. If it fails, then repairing it may be the only solution.
     
  20. lanab

    lanab Formula Junior

    Feb 21, 2016
    510
    Stockholm, Sweden
    #20 lanab, May 2, 2023
    I have not replaced the motor, might do that when i have repaired everything else in the HVAC system.

    You know where i can find a new motor or OEM part?
     
  21. Qavion

    Qavion F1 World Champ
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    #21 Qavion, May 2, 2023
  22. lanab

    lanab Formula Junior

    Feb 21, 2016
    510
    Stockholm, Sweden
    #22 lanab, May 2, 2023
    Thanks, seems like the whole evaporator unit needs to be removed....
     
  23. evo11

    evo11 Karting

    Sep 21, 2020
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    #23 evo11, May 2, 2023
    guys, where HVAC ECU is located? I understand that there is a high chance that it is actually damaged?
     
  24. evo11

    evo11 Karting

    Sep 21, 2020
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    #24 evo11, May 2, 2023
    consedering rx500h as time to buy suv finally.
     
  25. PhilB

    PhilB Formula 3
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    Feb 17, 2004
    2,312
    Southern New Jersey Shore
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    Phil
    #25 PhilB, May 2, 2023
    Passenger side, under the "frunk" cover, between the shock and firewall. It's in a "box" like unit, not sure if you can make this out but it's the only photo I have:

    Image Unavailable, Please Login
     
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