Cummins isx 15 coolant loss no external leak

Take the clamp off the back side of the cooler, where the airflow exits to the egr valve.. you should be able to see some coolant that way but if its demandated and has no air flow then maybe not...

Most likely it is head or head gasket .. its a cummins thats what they do, im dealing with the same problem

 

you only need to pop a clamp off to see if its has coolant leaking.. but if you are going to take the whole thing off then everything in front of it needs to come off... If you are good with wrenches you can get down to it in about an hour or so, as long as no bolts snap off

 

^^ YUP ^^

 

I ran it to get it home and parked it.. itbis your truck u can do as u wish. I woukd not run it if its burning coolant... One thing you can do is pressurize the coolant system, drain the oil and drop the pan, then lay underneath the engine and watch for coolant dripping.. if you see any then you know the engine needs to come apart

 

Nice.. i was going to recommend putting pressure on there to see if any external leaks but forgot to reply. Glad it was something easy and dont cost u to much money