I applaud you for your patience in dealing with this issue!
Thanks fastdriver. Sorry to hear that your experience was not a pleasant one. I feel that I am in a position to have some patience for various reasons. First, I am going to step back and take a look at this issue, not only as a consumer, but as an outsider. I want to give GM the opportunity to take care of their customers and show that they are doing something to help remedy the problem. I am trying to take an approach that is patient, but yet exhausting all the resources I have available with GM and my dealership and placing accountability where it should be. I am choosing to post my progress on this thread so everyone can see the approach I took and GMs response. I understand that others have been here before me without the best results. I am hoping that something will surface to benefit not only me, but everyone thorough this process. I am not looking for an immediate fix at this moment as I understand this issue is quite complex. But I am looking for progress, updates, and eventually a permanent fix. GM owes that to all of us. I know this thread has been a valuable tool in helping me work thorough this process. I do think someone realizes "GM, we have a problem" and they have returned to the drawing board.
So with that in mind I thought I would post some tips that are working for me to "survive" in my Cruze while I wait patiently:
1) I always have a window cracked when driving.
2) I monitor the DIC. When the temp reaches the 190s - 200s, I back the temp control to the 1:00 position.
3) The cabin appears to be more comfortable with fan switch in #3 position. If I go to fan switch 1 or 2 -

4) I never use defrost mode unless absolutely necessary.
5) I use the heat only when necessary (hard to do in Montana during the winter).
6) I noticed that keeping my cabin properly ventilated by rolling down two windows in the garage after driving helps to eliminate any buildup of vapors and the next morning the cabin is clear of strong odors.
Is this an inconvenience? Absolutely, but I am making it manageable at this time.
Fortunately, my wife has a 2012 Honda Odyssey which is our family vehicle. So, I choose not to transport my wife or son in the Cruze due to the nature of this problem.
After my last trip to the dealership to ensure the PI was completed correctly I took the Cruze on the road for a test drive. As the temp reached the 200s I cracked the window and "blasted the heat" - full temp control (3:00 position), fan on #4. I drove for several miles. In a short period of time I needed to purge the vehicle with fresh air.
Results:
1) Cabin reeked like antifreeze (strong smell) for an extended period of time. After parking in garage antifreeze smell in garage for several hours. (Somewhat common after driving - just appeared to be a much stronger smell then usual after this drive).
2) Appeared to have an antifreeze taste in my mouth and residue in my nostrils. This is not a common occurrence as I think it is because my commute to work is usually a short drive. It appears that I pushed the car a little harder then usual after the PI maintenance and appeared to encountered the smell at a much higher level leaving a bad taste and smell in mouth and nose. Did not last for an extended period of time, but enough to be irritating.