Coolant leaking from reservoir overflow

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by DAVEST LLC, May 12, 2023.

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  1. May 12, 2023 #1
    DAVEST LLC

    DAVEST LLC Bobtail Member

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    I have coolant leaking from the side cover of the reservoir overflow I have changed the thermostat but still leaking this happens when I have heavy pressure like climbing hills or in a heavy traffic. Anybody have similar experience and any solutions to the problem my truck is a paccar engine mx13 with about 850k miles
     
    DAVEST LLC, May 12, 2023
    DAVEST LLC, May 12, 2023
    #1
    silverspur Thanks this.
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  3. May 12, 2023 #2
    silverspur

    silverspur Road Train Member

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    Show us a picture. It's the weekend and a part might not be available until Monday
     
    silverspur, May 12, 2023
    silverspur, May 12, 2023
    #2
  4. May 12, 2023 #3
    ducnut

    ducnut Road Train Member

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    PACCAR reservoirs are a known problem. Replace it AND the sensor.
     
    ducnut, May 12, 2023
    ducnut, May 12, 2023
    #3
    Last Call and DAVEST LLC Thank this.
  5. May 12, 2023 #4
    D.Tibbitt

    D.Tibbitt Road Train Member

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    Gettin' down westbound
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    If its blowing out the breather under heavy load its a possibility you have combustion entering the cooling system.. Get a block tester kit and test if theres any sign of combustion gases present in the coolant system
     
    D.Tibbitt, May 12, 2023
    D.Tibbitt, May 12, 2023
    #4
    InTooDeep, Oxbow, Last Call and 4 others Thank this.
  7. May 12, 2023 #5
    FLHT

    FLHT Road Train Member

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    My guess its the EGR cooler..
    Any coolant out the exhaust ?
     
    FLHT, May 12, 2023
    FLHT, May 12, 2023
    #5
  8. May 13, 2023 #6
    DAVEST LLC

    DAVEST LLC Bobtail Member

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    No
     
    DAVEST LLC, May 13, 2023
    DAVEST LLC, May 13, 2023
    #6
  9. May 13, 2023 #7
    Ridgeline

    Ridgeline Road Train Member

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    REPLACE YOUR CAP.
     
    Ridgeline, May 13, 2023
    Ridgeline, May 13, 2023
    #7
    Last Call Thanks this.
  10. May 13, 2023 #8
    DAVEST LLC

    DAVEST LLC Bobtail Member

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    I already replaced the cap and thermostat at the same time
     
    DAVEST LLC, May 13, 2023
    DAVEST LLC, May 13, 2023
    #8
  11. May 13, 2023 #9
    Goodysnap

    Goodysnap Road Train Member

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    Chassis number? What year?
     
    Goodysnap, May 13, 2023
    Goodysnap, May 13, 2023
    #9
  12. May 14, 2023 #10
    DAVEST LLC

    DAVEST LLC Bobtail Member

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    2016 kw
     
    DAVEST LLC, May 14, 2023
    DAVEST LLC, May 14, 2023
    #10
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