Coolant leak from reservoir tank cap

Discussion in 'Freightliner Forum' started by irishluck09, May 3, 2021.

  1. irishluck09

    irishluck09 Light Load Member

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    Nov 24, 2019
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    2014 cascadia dd13

    Ive noticed i have coolant coming out of my top coolant cap on my reservoir tank

    Just wondering if ya'll think my cap is bad or if i have a underlying issue causing too much pressure?
     
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  3. Antinomian

    Antinomian Road Train Member

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    I'd try a new cap first. If the pressure goes over 15 pounds it should vent through the side cap, not the top.
     
  4. baha

    baha Road Train Member

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    The rubber 0/ring on cap is cracked or broken, put a new factory cap not a china made copy on it.
     
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  5. truckdriver31

    truckdriver31 Road Train Member

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    loosen it some where it dont build pressure. see if it still comes out.
     
    Last edited: May 3, 2021
  6. Ridgeline

    Ridgeline Road Train Member

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    Just start with replacing the cap, the actually where out.
     
  7. irishluck09

    irishluck09 Light Load Member

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    Yea i figured just a bad cap. I mean i can physically see it bubbling out from the bottom of cap. And the truck isnt overheating or anything
     
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  8. truckdriver31

    truckdriver31 Road Train Member

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    my second truck never did. i bought a pretty purple freightliner from select trucks once. paid cash. truck never made it past 6 months. come to find out cap had just 1 o ring on it to keep pressure from building. i put new cap on it. truck used 2 gallons a day of coolant.
     
  9. Joyce's Volvo

    Joyce's Volvo Light Load Member

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    Don't want to be the bearer of bad news but, you could have other issues. Take cap off (carefull if it's hot )and start up , look in with light and see if it's got bubbles , if you got Constant bubbling it could be bad to worse, bad= air compressor , worse= head gasket, devastating = cracked head. Don't forget about ,expansion if you filled too much, as it warms the water will expand in volume % wise to temp, hopefully your just over filled.
     
  10. Antinomian

    Antinomian Road Train Member

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    But in that case it should still be venting out of the side cap, not out of the top cap.
     
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