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Most auto shops have a test kit for combustion in the coolant. Chances are you have some type of head gasket or sleeve failure.

When you flush it out you need to drain it and then take off the upper radiator hose and stick a water hose in there to really get all the rust and gunk out. I have heard stories off all kinds of yuck and gunk coming out.

It's in there. You can order the gasket set from cummins its around 80 bucks not including the thermostats and their respective gaskets. It's a real problem when that engine runs hot. Very easy to kill a head gasket or worse. If your coolant looks rusty you should do a full flush. Hose the whole...

The 8.3 has 2 thermostats next to each other. They are housed by the alternator. There are a few gaskets used in the replacement process along with 2 thermostats and thermostat gaskets.