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FLD 120 overtemp buzzer

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by W Bench Farms, Mar 31, 2019.

  1. Mar 31, 2019 #1
    W Bench Farms

    W Bench Farms Light Load Member

    206
    346
    Oct 16, 2017
    0
    6nz in an FLD120. Replaced temp sensor on top of thermostat housing and gauge sensor. Overtemp buzzer will come on sporadically, sometimes at 150, sometimes 175. Engine isn't hot. Haven't been able to figure out why buzzer and light is coming on. Found what I think to be another temp sensor on right side at the top rear of the head above the exhaust manifold. Tried unhooking and hooking back up. I'm 75% sure this is the issue, but haven't been able to find out exactly what this sensor is for, or a part number. Any advice?
     
    W Bench Farms, Mar 31, 2019
    W Bench Farms, Mar 31, 2019
    #1
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  3. Mar 31, 2019 #2
    McMahons Trucking

    McMahons Trucking Light Load Member

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    119
    Jul 4, 2018
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    Have you checked the wire that goes from the AC sensor by the radiator and goes up to the sensor that turns the fan on? Sometimes it gets pinched between the frame and radiator.
     
    McMahons Trucking, Mar 31, 2019
    McMahons Trucking, Mar 31, 2019
    #2
  4. Apr 5, 2019 #4
    W Bench Farms

    W Bench Farms Light Load Member

    206
    346
    Oct 16, 2017
    0
    Found the problem. Sensor on top rear right side of head above exhaust manifold. It is a normally closed switch. Bypassed it and fixed the problem. Now to find a replacement. Haven't been able to find a part number.
     
    W Bench Farms, Apr 5, 2019
    W Bench Farms, Apr 5, 2019
    #4
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