Definitely coolant how can you tell if it is a head gasket or egr ? Or could it be something else?

 

For EGR Cooler, park truck nose down over night and remove EGR valve. Look for moisture in the bottom of the EGR port. For head gasket hook up a pressure gauge to the cooling system and watch for over pressurization. Don't drive the truck!!

 

X2, don't drive the truck I had this happen and drove it again for about a day and all he'll broke lose. Egr/oil cooler and heads all bad

 

A ruptured EGR Cooler can turn into a night mare and should be your first concern!! Coolant can seep into a cylinder and cause a hydro lock, bent rods, stretched TTY head bolts and blown head gaskets. After more thought given I wouldn't even start the engin but would jack the rear tires up 10/12 inches and check for moisture in the morning. Remember a ruptured EGR Cooler is most always caused by a plugged Oil Cooler. Here's where a Scangage2 would have alerted you to an arising situation. If the EGR Cooler appears to be O.K. then concentrate on the Head Gaskets. To sum it up : A ruptured EGR Cooler can cause the motor to crawl out of the Engine Bay and Kick THE **** RIGHT OUT OF YOU