Thanks for the great information!
Its good to know that I might not have a blown head gasket. I don't understand how a 15 psi cooling system could force it's way into a ~500psi combustion chamber, I just figured that the coolant entered he combustion chamber during the intake stroke.
I was definitely planning on replacing the timing belt during this job, thanks for checking.
I have the 100 kpa cap.
You think that I could be leaking all that water via water pump o-ring? It seems like the leak would be visible. I will definitely inspect/replace this oring before pulling the head. An observation that points to this o-ring failing is that the cloud of steam I see typically spans the full width of my car. I would expect the cloud to be considerably narrower and to be localized to the tailpipe side of the vehicle if it was a coolant going through the combustion process.
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