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Discussion in 'Technical Q&A' started by rosso ferrari, Sep 3, 2020.

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  1. rosso ferrari

    rosso ferrari Rookie

    Jan 24, 2020
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    emanuele
    #1 rosso ferrari, Sep 3, 2020
    Good morning friend, please would you be so kind to help me with a problem I have with my ferrari 355 gts, the problem is when the coolant temperature reaches 190 degrees the fan starts on the pilot side but the temperature continues to rise and the fan of the co-pilot side does not start. Please thank you if you can help me. Thank you
     
  2. Qavion

    Qavion F1 World Champ
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    Ian Riddell
    #2 Qavion, Sep 3, 2020
    Have you tried applying power directly to the fan to see if it works?

    Do you have a Motronics 2.7 or 5.2 (Two CHECK ENGINE lights or one?)
     
  3. Qavion

    Qavion F1 World Champ
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    #3 Qavion, Sep 3, 2020
    You could try checking the resistance of the water temperature sensor (Item 40) at a known temperature.


    https://www.ricambiamerica.com/car-diagrams/ferrari/v6-v8/355-group/f355-m5-2-1996/water-pump-and-oil-water-heat-exchanger.html

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    https://www.ebay.com/itm/Ferrari-328-348-355-456-512-550-Mondial-Temperature-Sensor-Part-125769-/122672672383

    I think it's in the same location on the 2.7 (note that that has two water temperature sensors as well as the standard water temperature sensor for the water temperature gauge).
     
  4. 05elise

    05elise Karting

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    #4 05elise, Sep 3, 2020
    Yes this is first thing to try. The original fan motors are not sealed so grit gets into them and they will seize up and/or the commutator will wear excessively.
     
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  5. wmuno

    wmuno Formula Junior
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    #5 wmuno, Sep 3, 2020
    If the motor is OK based on the above check, then the next thing to check is the fan relay and the fuse.
     
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  6. windsock

    windsock Formula 3
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    #6 windsock, Sep 3, 2020
    Check the fuses. There is an individual fuse for each motor. As the motors wear they will start to draw a lot of current and intermittently blow the fuse. Replacing the fuse is a short term solution but it will likely fail again.
     
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  7. rosso ferrari

    rosso ferrari Rookie

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    #7 rosso ferrari, Sep 4, 2020
    [QUOTE = "Qavion, publicación: 147424825, miembro: 174876"] ¿Ha intentado aplicar energía directamente al ventilador para ver si funciona?

    ¿Tiene un Motronics 2.7 o 5.2 (dos luces de VERIFICACIÓN DEL MOTOR o una?) [/ QUOTE]
    hola amigo es un motor 5.2 motronic
     
  8. rosso ferrari

    rosso ferrari Rookie

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    #8 rosso ferrari, Sep 4, 2020
    I have tried to put power to the fan and it works
     
  9. tbakowsky

    tbakowsky F1 World Champ
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    #9 tbakowsky, Sep 4, 2020
    Check fuses and relays. Your fan may work when powered directly by an outside power source, but it could be drawing way too much current due to age a wear and pop/melt the fuse or fry the relay.
     
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  10. Qavion

    Qavion F1 World Champ
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    #10 Qavion, Sep 4, 2020
    Last edited: Sep 4, 2020
    gracias )

    Check fuse 20 in the passenger footwell. Also try swapping relay R (Right radiator hand fan) with relay O (fuel filler release).

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  11. Skippr1999

    Skippr1999 F1 Rookie
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    #11 Skippr1999, Sep 12, 2020
    As others have said, check the fuse. I recently had a similar issue. Both fans had already been recently replaced and were working fine. Found that the fuse was melted from looses contacts on the fuse board. Had to order a whole new fuse board.
     
  12. Ferrarium

    Ferrarium F1 Veteran
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    #12 Ferrarium, Sep 18, 2020
    Also the relay socket can melt due to the constant 30 amp spike with the fans instant on going on and off frequently. I added Toyota PWM controllers to solve that. No more light dimming when fans kick on and general dropped load severity on the system as a whole.
     

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