Disappearing coolant

[Rawze]

(07-15-2016 )Sasquatch Wrote:  Hello there wise council, I need your help.
I have an 09/Pete/387 with isx , and all of a sudden yesterday and today, I am loosing coolant somewhere, while driving. I added 1/2 gallon yesterday, and 2 1/2 gallons earlier today, have been stuck in traffic for a couple of hours, this morning, but I do not seem to be able to see any leaks, or signs of coolant in my oil and such?? Any ideas?? Be gentle, if you can, I know just enough to be dangerous......

* Do a pressure test of the system and look for leaks.

* Check to see if pressure is building in the system when idling and/or when you get it under a load.

* Check the inside cover of the crank case filter to see if moisture/coolant is steaming out.

* With that much coolant loss, check the oil level in the engine to ensure it is not going UP.

* Check the oil level in the transmission. Petes are notorious for transmission cooler going bad and dumping coolant in transmission and destroying it.

* check for steam out the tail pipe.

* Check for water in the air tanks.

* Do an EGR cooler leak test ( https://youtu.be/tNmQnAJzmVo )

2.5 gallons is a VERY SERIOUS LEAK!.