Just went to change plugs and pulled coil pack out to get at spark plug and cylinder filled with antifreeze. Not piston cylinder spark plug cylinder. I'm leaning toward cracked head. no antifreeze in oil and no white smoke, so I don't think head gasket blew maybe block cracked any ideas???????

 

Which plug? you're sure it's not a leak from a hose somewhere?

 

Thinking a leaking hose too.

 

Yeah, which hole? If it's near the coolant crossover, it could be a leak from the intake-to-head seal, or the heater core hoses passing overhead.

 

it is in cylinder 6 not the thermostat not the intake or hoses checked all the simple things, truck is getting a coolant pressure test 2morow will post result. I preparing for the worst, dealer is already trying to say its not part of the powertrane warranty

 

Check out this picture. You can see the number 6 plug hole and next to it is the antifreeze cross over and T-Stat. Does this look like the location of your leak?

 

Well boys, I'm happy to admit I was wrong, no cracked head no cracked block. Had dealer do a coolant system pressure check had them leave it on for 20 minutes held 17lbs of pressure. They seem to think its the t-stat gasket, but i'm not convinced theres is a small residue but not much. I vaccumed it all out and its been driven 100 miles since, nothing has returned. I'm gonna change the stat and gasket anyways. And keep an eye on it.
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Thanks for reporting back here!