A couple months back bought an '06 powerstroke. During a recent snow storm I noticed, while sitting idling, the exhaust was turning the snow green. I suspect that its coolant, but where is it coming from? I'm kinda hoping that it's a the egr because it seems like the easiest and cheapest fix. Does this seem logical? Or did I buy one with developing head gasket/ head trouble?

 

My question is, Why is the coolant GREEN?

 

Park the truck nose down after its run a bit and then pull the EGR valve. If its wet inside the intake, probably a blown EGR cooler. If your running an EGR delete, only one way to get coolant into the intake I'm afraid.

Have any live data to go by, like coolant temperature and oil temperature?

The wet intake is what you need to confirm. Blown EGR coolers can lead to blown head gaskets.

 

If you've blown the egr, it's usually because the oil cooler is plugged, not allowing enough coolant to keep the egr "cool."
You really have to replace the oil cooler at the same time.