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Knowing what to sniff for definitely helps. Even if you don't know it's relatively easy to sniff inside the cabin and then compare the smells under the hood. If you smell the same thing under the hood the source is there and PI-0940 should be done (without the stupid hose reroute) and with extra care on the sealing of the engine cowl area. If the smell is different, then the source cannot be solely under the hood, although it may contribute and provide a blended smell in the cabin.It appears that at least you were able to narrow the smell to the HVAC case assembly. Good news for you that the engine compartment seems to be okay. I think it is important that others who are not familiar with the Cruze's engine compartment smell knows that these cars will have a smell after driving. My coolant smell is now mainly isolated and more prevalent around the turbo area after driving and it doesn't knock you on your feet. The tank and cap area still seem to be clear. Before my fix, my garage and the cabin of my Cruze smelled like I was recycling boiled antifreeze for a few hours after driving.
I am wondering what the odds are of having an "odor free" HVAC case assembly? I guess it all depends on how much lube is present in the box, (and/or) how often you use the heater and at what settings. If the odds are not in your favor then it appears that the smell will eventually "sneak" into the cabin over time. I am curious how Cruzes in warmer climate areas report problems with the HVAC case assemblies? It may be less noticeable then those of us living in colder climate areas based on the usage of the heater.
As for my transmission (A/T) (2012 LT) I have not had any issues at this time. Smooth shifting up/down so far.
The dirty sock smell I had would occur at any time with any blower fan setting and any heat setting, with or without the A/C on and with recirc on or off. Only once that was gone was I able to deal with heat related smells. The combination of the two is really, really rank but not as irritating to the eyes as the glycol alone.
As for the odds of having an odor free casing I suspect they are very slim for Cruzen in northern climates. What I suspect is that the more you use your cabin heater the more the grease will decay and it's the decayed grease that's the actual odor source. Cruzen in warmer climates may never exhibit this as their heaters just won't be run enough to break down the grease. I'd wager the 2014 model year will have very few cases of HVAC ducting lubricant related odors - XR reported that Lordstown has already switched to the new ducting lubricant. They are still producing 2013 model year Cruzen.
BigSkyMontana, I'd like to personally thank you for your time and patience with your dealership working this out as well as your time reporting the progress of what's been done, what worked, and what didn't work. Your efforts and reporting helped me help my dealership diagnose the source of my odors. Rob, thanks for suggesting I had a mold/mildew problem - that was about 70% of the smells I was getting and 100% in the summer.