Update. I took the car back and spoke to the manager and showed him the crappy job they did under the hood and not washing it off. I also told him on the phone the night before that I wanted a loaner car ready to go when I got there. I was pretty stern on the fact they screwed me over and I wanted it done right this time.
They told me the head must have a crack in it. They claim that they can only get remanufactured heads for the 2.2L Ecotec and GM doesn’t make new ones... Really?
Anyway I have a loaner car now... but this is the last time I go to this dealership for service!