Coolant Temp Sensor

Discussion in 'General Motoring' started by JJ, Oct 6, 2003.

  1. JJ

    JJ Guest

    I have a '95 SL2 with two coolant temp sensors.

    One is mounted to the engine block (I assume this is the one for the gauge)

    The other is mounted in the coolant reservoir tank. ( I assume this is the
    one for the aux. fan to turn on)

    Am I correct?
    If not what is the function of the one mounted in the coolant reservoir
    tank?

    Jerry
     
    JJ, Oct 6, 2003
    #1
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  2. JJ

    Kirk Kohnen Guest

    gauge)
    And for the computer.
    Nope. That's your coolant level detector.
     
    Kirk Kohnen, Oct 7, 2003
    #2
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  3. JJ

    JJ Guest

    I wondered about that.
    Can you explain how that thing works?
    Seems to be a glass enclosed microswitch.
    No contact with the coolant, just sits in a chamber which extends into the
    reservoir.
    I really don't understand how it works.
    Not really having problems with it, removed the tank to clean it out real
    good and saw it and when I removed it the rubber "o" ring fell apart.
    Doesn't seem to be a water seal as most of it was already missing. When I
    reinstalled it I used some Teflon tape to seal it. I assume the "o" ring
    seal is for dust & dirt.
    No leak as far as I can tell.

    Jerry



    gauge)
    And for the computer.
    Nope. That's your coolant level detector.
     
    JJ, Oct 7, 2003
    #3
  4. JJ

    JJ Guest

    I think I've got it. the sensor is a magnetic reed switch and there is a
    float with a magnet on it so that when the coolant gets too low the magnet
    activates the switch.
    I think I'm correct.

    Jerry


    I wondered about that.
    Can you explain how that thing works?
    Seems to be a glass enclosed microswitch.
    No contact with the coolant, just sits in a chamber which extends into the
    reservoir.
    I really don't understand how it works.
    Not really having problems with it, removed the tank to clean it out real
    good and saw it and when I removed it the rubber "o" ring fell apart.
    Doesn't seem to be a water seal as most of it was already missing. When I
    reinstalled it I used some Teflon tape to seal it. I assume the "o" ring
    seal is for dust & dirt.
    No leak as far as I can tell.

    Jerry



    gauge)
    And for the computer.
    Nope. That's your coolant level detector.
     
    JJ, Oct 7, 2003
    #4
  5. JJ

    BANDIT2941 Guest

    Both coolant temp sensors are located in the cylinder head. The one with 2
    wires is the one for the computer and the one with a single wire is the one for
    the gauge.
     
    BANDIT2941, Oct 7, 2003
    #5
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