Yesterday I was sitting out in my driveway seeing if a tune was working and suddenly I see smoke I thought. It turned out to be antifreeze vapor coming from the front of bank 1. Freaky was it sounded like pop corn in the microwave. The temp was 202 at the most. Put it in the garage and checked antifreeze level today. It was fine. I loaded another tune in and started it up. No problem cold then drove around till I got it to 214. Nothing not a plume of vapor nor any leaking antifreeze. Got me stumped.

 

I know the later year modular engines have a problem with the manifold cracking, maybe its just in its early stages? The earlier versions have aluminum manifolds btw. I know mine cracked and did that, and i didnt notice and coolant loss.. Just a thought man!

 

It's a plastic manifold with an aluminum crossover.

 

Yeah... they can crack sometimes.. Maybe you can either take it somewhere or run the coolant dye in it?