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Can't find coolant leak dd15 cascadia freightliner 2018

Discussion in 'Freightliner Forum' started by Theleftmate, Nov 22, 2020.

Page 1 of 2
  1. Nov 22, 2020 #1
    Theleftmate

    Theleftmate Bobtail Member

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    Oct 25, 2020
    0
    So, I have been having this coolant leak for a month now. I've been in the shop 3 times for them to find it and each time they do all the tests and never find it. I replaced my heater core because I did smell in in the cab after replacing that. The smell did go away. But the leak continued. Now, I am at a point where I am burning a gallon a day of coolant while driving and while sitting. I'm heading to Allentown PA now and will be putting in in another shop any suggestions on what else to have them check would be great. Also, any freightliner dealer or shop that works on freightliner around that area who someone knows could find the leak would also be a huge help. My truck has a dd15 380k miles 2018 cascadia freightliner. Any information would be a huge help thank you ahead of time
     
    Theleftmate, Nov 22, 2020
    Theleftmate, Nov 22, 2020
    #1
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  3. Nov 22, 2020 #2
    reeferwrencher

    reeferwrencher Medium Load Member

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    Aug 4, 2018
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    If you can't see any leak then maybe you have a bad head gasket and you're burning coolant.
     
    reeferwrencher, Nov 22, 2020
    reeferwrencher, Nov 22, 2020
    #2
  4. Nov 22, 2020 #3
    86scotty

    86scotty Road Train Member

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    Get yourself some coolant dye and a blacklight flashlight off Amazon. I did this and solved all my coolant problems. That is, of course, it it's not internal.
     
    86scotty, Nov 22, 2020
    86scotty, Nov 22, 2020
    #3
  5. Nov 22, 2020 #4
    25(2)+2

    25(2)+2 Trucker Forum STAFF Staff Member

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    There is a small line running alongside the engine from the back up towards the surge tank, not sure where it starts and ends, but it leaks intermittently, the FL(WS) shop knew about it and replaced the line, the lease shop was unable to find the leak in 2 tries. 3 times, lost enough coolant to trigger shutdown, but never found a puddle and it wasn't being burned.

    The replacement line is metal, I believe.
     
    25(2)+2, Nov 22, 2020
    25(2)+2, Nov 22, 2020
    #4
    MAKSTRANS and Hammer166 Thank this.
  7. Nov 22, 2020 #5
    AModelCat

    AModelCat Road Train Member

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    Anybody test the EGR cooler? Be my first go-to if there was no external leak.
     
    AModelCat, Nov 22, 2020
    AModelCat, Nov 22, 2020
    #5
  8. Nov 22, 2020 #6
    25(2)+2

    25(2)+2 Trucker Forum STAFF Staff Member

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    Wouldn't that lead to burning coolant?
     
    25(2)+2, Nov 22, 2020
    25(2)+2, Nov 22, 2020
    #6
  9. Nov 22, 2020 #7
    AModelCat

    AModelCat Road Train Member

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    Yep it'd be putting coolant into the EGR stream. EGR cooler is typically a higher-fail item than a headgasket from what I've seen. Generally speaking of course.
     
    AModelCat, Nov 22, 2020
    AModelCat, Nov 22, 2020
    #7
  10. Nov 22, 2020 #8
    25(2)+2

    25(2)+2 Trucker Forum STAFF Staff Member

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    That line I mentioned is very high fail, from what little they tell the idiot driving, meaning me.
     
    25(2)+2, Nov 22, 2020
    25(2)+2, Nov 22, 2020
    #8
  11. Nov 24, 2020 #9
    NorCenArk

    NorCenArk Light Load Member

    76
    35
    Mar 31, 2011
    Russellville, AR
    0
    On the driver's side of engine, there is about a 3/4 black plastic line running from near top of engine to air compressor. There is also a short one from air compressor back to block. These are prone to leak, you are at the mileage they begin. Pay close attention around the clamp just above the oil filter.
     
    NorCenArk, Nov 24, 2020
    NorCenArk, Nov 24, 2020
    #9
    Hammer166, BoostedTeg and 25(2)+2 Thank this.
  12. Dec 4, 2020 #10
    Oscar the KW

    Oscar the KW Going Tarpless

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    You can usually tell if it’s that by pulling the hump hose off the intake side and seeing if there’s any moisture in there I believe.
     
    Oscar the KW, Dec 4, 2020
    Oscar the KW, Dec 4, 2020
    #10
    AModelCat and 25(2)+2 Thank this.
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