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Coolant Temperature Sending Unit

Discussion in '365 GT4 2+2/400/412' started by Schumi, Sep 24, 2015.

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  1. Schumi

    Schumi Formula Junior
    Owner Silver Subscribed

    Jun 5, 2002
    867
    Missouri
    Full Name:
    Daren
    #1 Schumi, Sep 24, 2015
    Does anyone know where the coolant temp. gauge gets its signal? I don't think it is from the thermo switch at the bottom of the radiator as that is a simple on/off switch for fan control. Any help would be appreciated.
     
  2. Rifledriver

    Rifledriver Three Time F1 World Champ

    Apr 29, 2004
    37,122
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    Brian Crall
    #2 Rifledriver, Sep 24, 2015
    As I recall it is on the back of one of the cylinder heads.
     
  3. Schumi

    Schumi Formula Junior
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    Jun 5, 2002
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    Daren
    #3 Schumi, Sep 24, 2015
    I have looked through the diagrams and haven't found it. There is a temperature sensor located at the rear of the block between the two heads, but I think it is for the injection system and not the gauge.
     
  4. Rifledriver

    Rifledriver Three Time F1 World Champ

    Apr 29, 2004
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    Brian Crall
    #4 Rifledriver, Sep 24, 2015
    Last edited: Sep 24, 2015
    Back of the head. Not the top of the block.
     
  5. Schumi

    Schumi Formula Junior
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    Daren
    #5 Schumi, Sep 24, 2015
    Rifledriver - I understood what you said and I should have put a ? at the end of my post. After your initial post I went back and looked at the two parts diagrams for the heads but I couldn't find anything that looked like a sending unit.
    This is a mystery I guess as no one I've spoken to knows either exactly where it is.
     
  6. Rifledriver

    Rifledriver Three Time F1 World Champ

    Apr 29, 2004
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    Brian Crall
    #6 Rifledriver, Sep 25, 2015
    Look at the motor maybe?


    83 400i parts book

    Table 4

    #31

    Do you want the part number too?
     
  7. Schumi

    Schumi Formula Junior
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    Daren
    #7 Schumi, Sep 25, 2015
    Thank you very much for the info. Is this something that can be tested/replaced without removing the head?
     
  8. Arvid

    Arvid Formula Junior

    May 28, 2012
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    Arvid Andersson
    #8 Arvid, Sep 25, 2015
    For testing the instrument you first have to locate the wire/connector towards the sensor,disconnect it from the sensor and connect it to ground/chassis. The instrument should then read peak level when wire is grounded.

    For testing the sensor the best would be to unscrew it and measure the ohms as you heat it. Ohms should decrease steadily as you heat it up. If no ohms are measured or values over 20K,replace the sensor.

    I think :)
     
  9. Schumi

    Schumi Formula Junior
    Owner Silver Subscribed

    Jun 5, 2002
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    Daren
    #9 Schumi, Sep 25, 2015
    That is super helpful! Thank you. I will see if I can locate the dang thing this weekend.
     

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