Dd15 losing coolant

Dd15 losing coolant DEFAULT
  1. I have a 2011 Cascadia with DD15 motor and 10 speed manual. I am losing 1 gallon of cooliant every 350 miles. No obvious leak when idle or sitting over night. As soon as i stop running the truck and let it idle, some smoke comming from passenger side of bottom side near leaf springs from Crank Case Breather tube. After a few minutes, the smoke lessens. I only notice the blow by smoke since truck started losing cooliant.

    After 6 hour idle, there are no sign of cooliant leaking, no puddle on the ground anywhere.

    There are NO check engine light, truck runs strong, mpg is the same. There are no smoke at all from Muffler exhaust pipe.

    I did oil analysis and it had no water in oil. It does have high sodium and potassium. Everything else from analysis is normal.

    What could be the problem ?
    Last edited: Aug 18, 2018
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  3. Gotta be a leak somewhere.

    Get the engine thoroughly washed, run it, then shut down and get down there with a good flashlight and look for ANY trace of coolant. Especially check the hoses by the clamps. Freightliner really likes the cheap compression clamps. You should go through and replace those with the more standard screw type hose clamp.

    Also check the lines leading to the cab heater core and the bunk heating system. There is generally a separate heater core back there somewhere to provide heat off the engine during idle, regardless of the presence of aftermarket bunk heater (idle reduction tech like a Webasto or Espar).
  4. Potassium and sodium are coolant additives. You are getting coolant in the crankcase. EGR cooler would be a good starting place to check.
    A bad EGR cooler wouldn't leak into the crankcase though. It would leak into the intake.
  5. A bad EGR cooler wouldn't leak into the crankcase though. It would leak into the intake.
    You are correct, an EGR cooler leaking introduces coolant into combustion chamber via intake. The sodium and potassium used as part of coolant package does not react during combustion and is carried from cylinder liner via the oil film to the crankcase and is suspended in the motor oil.
    KB3MMX, FdEF and magoo68 Thank this.
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    RE: 2011 dd15 black overflow tank

    I can't find the actual bulliltion again but here is a copy and paste

    The coolant filter has been removed from DD platform engines. The change comes with an improved Oil Cooler Module which resides on the front, left-hand side of the engine and houses the coolant pump, thermostat, oil fill, and oil filter. On engines built prior to this change, the coolant filter access cap was located just forward of the oil filter.
    The current coolant filter is only partial flow (~15%). Testing showed that coolant and engine protection were not affected by the removal of the coolant filter. Customers will also benefit from reduced maintenance costs by eliminating the coolant filter inspection/replacement cycle.
    The new Oil/Coolant Module is NOT backwards compatible on older engines. However, customers may choose to remove the coolant filter on their current engines at the next applicable Preventative Maintenance stop.
    The new Oil/Coolant Module became effective with the following approximate change points.
    • DD15AT engine s/n 472906S0326388 built on 23-Mar-15.
    • DD13 engine s/n 471927S0326736 built on 17-Mar-15.
    • DD15TC engine s/n 472909S0327137 built on 17-Mar-15.
    • DD16 engine s/n 473908S0327187 built on 19-Mar-15.
    Please note that the new oil fill is now connected at the bottom by a flexible tube, which increases the restriction when the engine is filled with oil. Shops using an automatic oil filling machine may need to adjust their flow rate to avoid spills

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