2001 F360 Modena Bower Motor Stuck On | FerrariChat
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2001 F360 Modena Bower Motor Stuck On

Discussion in 'Technical Q&A' started by mxbennett, Jan 15, 2024.

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  1. mxbennett

    mxbennett Rookie

    Aug 27, 2010
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    #1 mxbennett, Jan 15, 2024
    Hi - the blower motor on my F360 is stuck in the full blast on mode whenever the battery is connected. Nothing turns it off other than disconnecting the battery. Anyone run across this?
     
  2. Qavion

    Qavion F1 World Champ
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    #2 Qavion, Jan 15, 2024
    Last edited: Jan 15, 2024
    That's going to be a hard one to pin down.

    Control Panel?
    ECU?
    Fan Controller ("hedgehog")


    In the meantime, there is a green 30 amp fuse on the side of the evaporator (in the cabin) which will kill the fan (only) if you want your battery not to go flat.

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    I don't know if it's possible to isolate the issue by pulling the plug on the control panel. When I do that on my F355 I vaguely recall that fan still runs (perhaps at a default speed).

    I think fan controllers are no longer available, but they can be repaired by specialists.
     
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  3. Qavion

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    #3 Qavion, Jan 15, 2024
    Last edited: Jan 15, 2024
  4. Qavion

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    #4 Qavion, Jan 15, 2024
    Rethink:

    The blower fan uses live battery power. The fan seems to be getting a direct earth/ground from somewhere (to complete the circuit). This can either come from a short in the fan wiring or from the fan controller. The circuits in the fan controller seem to be powered by key power (via the orange wire), so perhaps should not be operating with the key turned off.

    Does this mean the fan controller has a short?

    If you disconnect the 5 pin plug instead of the 2 pin plug on the fan (speed) controller, does the fan still run at full speed when you turn on the battery?
     
  5. Qavion

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    #5 Qavion, Jan 15, 2024
    Last edited: Jan 15, 2024
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  6. mxbennett

    mxbennett Rookie

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    #6 mxbennett, Jan 15, 2024
    I replaced the power transistors in the unit shown in the diagram a couple years ago when the fan failed in the off condition and it fixed it until now. Tried to get a replacement unit but they were not available
     
  7. mxbennett

    mxbennett Rookie

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    #7 mxbennett, Jan 15, 2024
    Thanks. That at least allows me to keep the battery connected.
     
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  8. Qavion

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    #8 Qavion, Jan 15, 2024
    https://www.technozen-electronics.co.uk/mg-zs-rover-45-climate-control-repairs/

     
  9. mxbennett

    mxbennett Rookie

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    #9 mxbennett, Jan 15, 2024
    It failed in the off condition a while back. I couldn’t find a replacement controller so I opened the unit and replaced the failed power transistors. That worked until now, when its failed in the open condition. I have not checked the current draw on the motor as I assumed the electronics were protected by the fuse. Is that a known issue - excessive current draw causing a failure in the full on mode?
     
  10. Qavion

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    #10 Qavion, Jan 15, 2024
    I'm really not sure of the internal circuitry of the controller. I imagine that the power transistors normally limit the current going to the fan (hopefully before the fuse blows).

    I'm no expert in electronics. Can an overheated power transistor go short circuit, providing a current path for the fan motor?

    Also, I don't know if the live battery power is used in the transistor bias circuits or if the control is all done with key power. Maybe you could try pulling the 5 pin plug on the controller, removing the control signal from the ECU just to see what happens (even if this might not help with diagnosis).
     
  11. mxbennett

    mxbennett Rookie

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    #11 mxbennett, Jan 15, 2024
    This is interesting as the motor runs at full speed anytime the battery is connected regardless of key position.
     
  12. mxbennett

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    #12 mxbennett, Jan 15, 2024
    I was just reading up on power transistors and I believe they can fail either open or closed. Last time they failed open. I’ll run through the diagnostics again.
     
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  13. Qavion

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    #13 Qavion, Jan 16, 2024
    Of course, there might be other components in the controller causing this issue. Did you take any photos of the internals last time?
     
  14. mxbennett

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    #14 mxbennett, Jan 21, 2024
    To update. I installed a small toggle switch under the dash on the power wire to the motor (green) fuse so I can operate the car while I order power translators (again) to replace them in the regulator. I’ll check the current this time to see if that’s what’s causing them to fail.
     
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  15. mxbennett

    mxbennett Rookie

    Aug 27, 2010
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    #15 mxbennett, Feb 14, 2024
    Just to update. Tester power transistors and they were bad again. Replaced them, which only took an hour this time, and everything works fine. What I’ve learned is failure of the system off (1st time a few years ago) and the more recent failure with the fan on full blast were both caused by the transistors failing. Root cause may still be the current draw out of the fan which I still need to check. I left the toggle switch on the input power in place so I could leave the system off and still drive the car while I figure out this last item. Appreciate all the assistance through the forum.
     
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  16. Qavion

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    #16 Qavion, Feb 14, 2024
  17. L1MTD

    L1MTD Karting

    Jun 2, 2019
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    #17 L1MTD, Oct 23, 2024
    Any further updates? I believe I am having the same issue. Did you ultimately find the underlying issue?
     

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