I have the same issue with the A/C not working well whatsoever on my 2016 Chev Trax. Once the temperature hits about 90 or above. If the sun's not bearing down, then the A/C will typically work fairly decent. Then again, I live in Bradenton/Sarasota FL. At least 90 days/year are disgustingly warm and when you go somewhere 20-30 mins away, in your properly serviced vehicle, you don't expect to arrive sweating, since the A/C has been on speed 2-3 the entire trip.
I've discovered there's a Service Bulletin issued that informs mechanics to not fill the A/C coolant all the way, as it creates this diminished A/C result. What shows Chevy really cares, is when you take it to the dealer to have them correct the manufacturer issue, and let some A/C coolant out of the system, they don't see why I disagree with being billed for the "fix". I'd do it myself, but I'm scared since I'm not a pro with A/C. However, if I did and messed something up, I would be ok with being billed.
So c'mon Chevy.....do the right thing, and eat the cost to correct an issue to some defect in the Trax' A/C system. It's absurd to expect me to pay for diagnostic, and replacement of some possible problem parts, when all I'm asking for is to let some freaking freon(or whatever it's called now) out. If that doesn't fix the issue, then we'll start exploring. Due to the lack of care and uninterest Chevy has displayed, as of right now I'll NEVER buy a Chevy again. Doing things right, and thinking about the customer could create strong loyalty.....The decisions made regarding the whole situation will determine what vehicles I purchase in the future, and will demonstrate the truth regarding your value of customers.
Disappointed and very frustrated