D13 - Low coolant level without any coolant loss/leaks

Discussion in 'Volvo Forum' started by Pawel-pl, May 3, 2021.

  1. Pawel-pl

    Pawel-pl Light Load Member

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    Jul 3, 2017
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    Hello,

    In my 780 with D13 engine, the low coolant level started to show up a few days ago. There are no leaks or any coolant loss, so I changed the sensor but the msg still shows up. Funny thing it is showing only when I accelerate.

    Do you guys know what can cause this or how to fix it?
     
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  3. baha

    baha Road Train Member

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    You can try 1st to put small amount of coolant in at a time to keep it from uncovering the low coolant sensor when you mash the fuel pedal and when it stops sending the code put a mark on coolant res. to show you how full it should be to fix the problem?
     
    Rideandrepair Thanks this.
  4. uncleal13

    uncleal13 Road Train Member

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    Humboldt, Sk
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    I had a mystery leak like that. Over several months every time I was underneath greasing the truck I found a loose clamp in various locations. Eventually I got them all and it stopped leaking. Sometimes they leak very little and dry off quick, but eventually they show themselves.
     
  5. Pawel-pl

    Pawel-pl Light Load Member

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    Jul 3, 2017
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    There is no leaks at all and the coolant level is good, the msg is showing up on dash. Not sure why
     
  6. Rob100100

    Rob100100 Light Load Member

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    Mar 5, 2016
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    Bad sensor wiring harness maybe
     
  7. Pawel-pl

    Pawel-pl Light Load Member

    52
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    Jul 3, 2017
    0
    Got it fixed today, the coolant tank has a ring floating piece with magnet inside, this thing either got dmg, stucked or just old and it stoped floating. After change to another coolant tank, with the same old sensor, all is good and low coolant is not showing up anymore.
     
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