Coolant strangeness.
#21
Let's hope for your sake that I'm right, but it sounds like you might have air in your cooling system. You say you had your egr cooler replaced.. If the cooling system wasn't burped completely(there is a bleeder screw above your exhaust manifold) and there is air in the system, it will also cause the symptoms you described. I would try that, and also pull the thermostat and boil it. Stick a candy thermometer in the pot and watch to see that the thermostat is opening at the correct temp. Have the radiator cap tested as well. Check the cheap and easy things first before you panic and spend money that you don't need to spend yet. Hopefully you'll find it's nothing major.
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