Pushing coolant

[Rawze]

(04-28-2019 )Rockycoon75 Wrote:  Truck sat for 40+ hrs over the weekend when I opened the cap to top it off before I started it this morning it still had a lot of pressure in the tank. I would have thought that it would have all been gone with a bad head gasket. But I have thought wrong before. I was just shocked that it had that much pressure still

that does not tell you squat.

That thing could sit pressurized for a week and it oozing coolant into the crank case and never see it as a pressure loss. Coolant is only 15 psi normally,.. cylinders have upwards of 15,000+ psi in them and can lift a weakened place in head or liner or gasket. - Only correct test is to pressure it up with 20 psi to the coolant system with the oil pan off it and let it sit over night. - bar engine next day slowly and listen for few drops of gurgling around piston rings, and give good inspection for coolant seepage around liners, bottom of crank, etc. etc. Also check if there is seepage from compressor, and check turbo drain line too while the pan is off.

then also not to forget to check back side of EGR cooler and doser injector for leakage, and for external leaks while your at it.