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Coolant leak but can't find where is from?

Discussion in 'Freightliner Forum' started by nsxftw, Oct 28, 2014.

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  1. Oct 28, 2014 #1
    nsxftw

    nsxftw Light Load Member

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    I have 07 century w detroit 60series. I thought leak was from coolant reservoir so I replaced brand new reservoir tank but after drove 500 miles the level dropped from Max and about 2inch. I check all the coolant lines on the engine and have not spotted any leak. Is there any other lines that deal w coolant?
     
    nsxftw, Oct 28, 2014
    nsxftw, Oct 28, 2014
    #1
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  3. Oct 28, 2014 #2
    Old Man

    Old Man Road Train Member

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    Maybe head gasket or pitted liner.
     
    Old Man, Oct 28, 2014
    Old Man, Oct 28, 2014
    #2
  4. Oct 28, 2014 #3
    nsxftw

    nsxftw Light Load Member

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    I also would like to say when I got rid of old coolant reservoir there was some oil in it which make the tank looks dark.
     
    nsxftw, Oct 28, 2014
    nsxftw, Oct 28, 2014
    #3
  5. Oct 28, 2014 #4
    nsxftw

    nsxftw Light Load Member

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    What's the pitted liner if u don't mind?
     
    nsxftw, Oct 28, 2014
    nsxftw, Oct 28, 2014
    #4
  7. Oct 28, 2014 #5
    bad-luck

    bad-luck Road Train Member

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    there could be several reasons for this. At first I was going to suggest that the cause was an EGR cooler and tell you how to diagnose that problem. But now that you said you're coolant is dark I am leaning towards an injector cup. Detroit series 60 s are known for the injector cups leaking.if its an injector cup it's actually diesel fuel getting into your coolant not oil
     
    bad-luck, Oct 28, 2014
    bad-luck, Oct 28, 2014
    #5
  8. Oct 28, 2014 #6
    Freightlinerbob

    Freightlinerbob Road Train Member

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    Have you ruled out the bunk heater? When you park it overnight, is there a puddle under the right rear corner of the bunk?


    Also, how full are you filling the reservoir initially? Mine will spit out anything 1/4" above the "Cold Min" line almost immediately and then stay there for months on end until the small leak in the bunk heater finally causes me to add just a little.
     
    Freightlinerbob, Oct 28, 2014
    Freightlinerbob, Oct 28, 2014
    #6
  9. Oct 28, 2014 #7
    nsxftw

    nsxftw Light Load Member

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    i don't have bunk heater in my truck. Also I should've flush all the coolant out when I bought the truck two month ago. It was already dark and i thought it was when old coolant reservoir was old/dirt

    Should I clean the coolant out then? Would it be head gasket if oil could be go through coolant?
     
    nsxftw, Oct 28, 2014
    nsxftw, Oct 28, 2014
    #7
  10. Oct 28, 2014 #8
    iraqralph43

    iraqralph43 Road Train Member

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    If the truck has an EGR cooler...thats what Im thinking
     
    iraqralph43, Oct 28, 2014
    iraqralph43, Oct 28, 2014
    #8
    Rideandrepair Thanks this.
  11. Oct 28, 2014 #9
    nsxftw

    nsxftw Light Load Member

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    Yes. I do have a EGR cooler.
     
    nsxftw, Oct 28, 2014
    nsxftw, Oct 28, 2014
    #9
  12. Oct 28, 2014 #10
    nsxftw

    nsxftw Light Load Member

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    i post on one of the thread, i had exactly same problem with that other guy that there is water dripping from passenger between air filter/firewall. It could be ac after i used right? I remember before i bought the truck, they have bypassed the heater line for the bunk so they put the line back in so i can used heater on the bunk. i wonder if that caused the problem for heater core?
     
    nsxftw, Oct 28, 2014
    nsxftw, Oct 28, 2014
    #10
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