Testarossa blower motor only works on high | FerrariChat
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Testarossa blower motor only works on high

Discussion in 'Technical Q&A' started by gizmo, Apr 25, 2007.

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  1. gizmo

    gizmo Rookie

    Mar 3, 2004
    7
    #1 gizmo, Apr 25, 2007
    the blower motor on my testarossa works fine, but as soon as you rotate the knob backwards to slow the speed down it shuts off completly. anybody have this problem before. also does anybody know where i can get a wiring diagram for a 1990 testarossa?
     
  2. MaleficVTwin

    MaleficVTwin F1 Rookie

    Jun 5, 2006
    4,312
    Reno NV
    Full Name:
    Matt
    #2 MaleficVTwin, Apr 25, 2007
    I'm not sure how the TR blower motor is wired, but in a "normal" car, that symptom is characteristic of a fried blower motor resistor. If I'm wrong, someone else please chime in. As far as wiring diagrams go, I'm not sure what you're looking to spend, but you can get the factory service and parts manual here on CD-ROM for $200.
     
  3. Boxer12

    Boxer12 Formula 3

    Jun 1, 2003
    1,672
    #3 Boxer12, Apr 25, 2007
    Change the Bosch fuse-the silver colored square thing in the fuse box. Look at the diagram in the fuse box to see which one it is. Diagnose it by swapping with another one that is working, or just buy a new one. They should be changed every few years. Buy a box of them. Should fix the problem for about $12. ;) Jim
     
  4. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
    Lifetime Rossa

    Jan 11, 2001
    26,506
    30°30'40" N 97°35'41" W (Texas)
    Full Name:
    Steve Magnusson
    #4 Steve Magnusson, Apr 26, 2007
    Do a search on "TR power transistor" -- should get you ~10 relevant threads with information on this topic.
     
  5. 4redude

    4redude Formula Junior

    Jan 13, 2005
    732
    Fungus Corner
    Full Name:
    Brian Keegan
    #5 4redude, Apr 30, 2007
    Steve (91tr) is correct based on my experience. Replace the power transistor (p/n 127014) and your problem should be solved. I think the resistor retails for about $125.
     

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