WWD,

So, on an otherwise stock vehicle with a GDE tune, would you expect to find combustion gasses in the coolant if there is a leak in the EGR system as you described? If yes, how might one distinguish between an EGR and HG leak, without removing the EGR?

Would you expect an EGR leak to result in residual pressure in the header tank of a cold motor?

Thanks!

DOC

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2005 KJ CRD Ltd Detroit TrueTrac Bilsteins G2 GDE "HOT" ECU GDE TCM "Tow Tune" "euro" TC SEGR Weeks Elbow New HG at 130K ARPs Clean CAT aFe Filter Magnaflow Exhaust EHM Cumminos In-Tank Lift Pump Hayden Fan Clutch Nylon Fan VH Enabled with GDE lower shutoff point Recalibrated Temp Gauge Tekonsha Prodigy Sears P-1 ZDDP

I would not expect that, it can only be a leak with a lot of pressure that is unable to relieve it self. EGR cooler leak would mean no vacuum or pressure under the cap as the engine cools down. Did you put a pressure test on the system and start it to see if you are indeed getting water in the exhaust?

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2006 LTD Bright Silver loaded with all the needed mods, CCV intact.
Proudly supporting CRD vendors, and their development of quality parts and accessories.
Equipped with HDS thermostat, plenty of heat, faster warm-ups, increased fuel mileage.

I think he meant the coolant bottle is pressurized, versus other models (like your favorite 4slow ) that have the radiator cap holding the pressure release valve and the coolant bottle just holding extra antifreeze.

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2005 kj CRD, samco, suncoast tc, provent, Kennedy lift pump, GDE ECO full torque, 2nd gen filter head, 245/70/16 a/t tires, mopar light bar, fumoto oil valve, OEM Skid Plates, ARB Front bumper and HD OME, tru cool LPD47391 40k GVW tranny cooler (stock cooler delete), FF Dynamics e-fan and shroud, rocker arms replaced, HDS2 190F thermostat.

Just like almost every vehicle made in the last 20 or so years.