Drives well for around 3 miles. Then immediately overheats. Blows lots of white smoke out of the engine bay and rolls a lot of coal. I was thinking water pump or head gasket definitely hoping water pump over head gasket. I'd like to be positive before I go buying parts and tearing things apart. Thanks

 

i think it's a head gasket??????????? "rolls a lot of coal"?????????????

 

I also wonder about the "rolls a lot of coal statement"…
Out the tail pipe?

How does the anti freeze look?

How does the oil look?

I don't think it will be the water pump as this sounds more like a head gasket.

 

Oil looks dark but not out of the ordinary for a diesel. It does leak coolant but stays a good color. And yes when the truck overheats it blows extra ordinary amounts of black smoke out of the tailpipe. It often blows some bc I have 50 hp injectors

 

Warm up the engine and remove the radiator cap. With it idling see if there are any bubbles coming up in the antifreeze. If there is,, head gasket,, probably.

 

White smoke or steam?

Black smoke has me stumped, that should be unburned fuel. White smoke out tailpipe would be antifreeze burning or maybe a turbo boot off...

When my Pontiac had a cracked head it would surge antifreeze out the raditaor like old faithful...had exhaust gas in there too.....