Rear A/C Blowing Only Hot Air?

Here is my car after two weeks of being at the dealership. I am just sick. My car is gutted. I don’t want this car back after hearing others issues. This is a GM problem. I am going to ck out the Lemon Law. I am in Indiana. Anyone gotten a new vehicle out of this mess.
Mine is one year old.

We took our car in two weeks ago for the wobble in the front end, the rear AC not working and a loss in performance.
They had the car for a week and put us in a brand spanking new GMC Terrain (2019) that had the 2.0 turbo, just like the Envision.

They called and told us to come and get the car, that they have ordered parts and they should be in around the 20th which is this week. When we got there, the service advisor told me that they ordered a rear AC unit, and an axle for the wobble. I asked her about the loss in performance. I told her that the GMC, which has the exact same engine has about twice as much power. She said her tech said "not the same animal" So given the GMC had the nine speed transmission, I thought I would look deeper. First I checked the specs. The engine in the two are exactly the same output specs. Then I looked up the 0-60 specs and they are almost the same.

Buick 0-60=7.0 seconds (motor trend)
GMC 6-8 to "mid 7s" couldn't find exact numbers but dang close. The GMC also had this funky "push button" transmission that I hated. P and R you pull out, like how you lift your power window button to raise the window. Push button for P and N. The nine speed tranny was nice and smooth. Wish ours had that. Why did I hate the push buttons? You can't shift by feel. It looked really cool, until I had to jockey the car out of a tight spot. With a gear shift, you can switch back and forth without looking. You can't with these bush buttons. You have to keep looking down at the dash to change gears.

So now we see what happens when I take it back later this week..Will post later.

After three weeks in the shop, we got the car back. I think it was torn down to the bottom like the car above to fix the rear air. I didn't see it but my SA told me it was. I gave her the TSB on the axles, but I think GM had already told the guy what to order so not sure if they are the same as on that TSB. The rear AC works again and the wobble is GONE!!! Hallelujah!! The only thing they didn't address was the loss of power. My SA said the tech didn't see anything wrong with it. I told her that's because it's not his car. This car used to have screaming passing power. Hit it at 40-50 to pass someone and it would fly. Now, it feels like a non-turbo car..Don't know what to do about that. No engine light, no actual driveability issue (except one time, I took off hard from a light, going up a slight incline and the car felt like it was lagging, like something was pulling it from behind)
They also did the TSB on the differential but I was not having any rattling issue.

So that's where I am at. Fixed AC, Fixed the dang wobble but now have no idea why my car isn't as zippy as it used to be. I told my SA I suspected it had something to do with the turbo. Perhaps the wastegate not working properly. Never in recent times have I had a car that spent this much time in the shop.

That stinks. The navigation antenna is a different antenna from the radio and XM. It's possible when they tore things apart they did not put the navigation antenna back in the Dashboard.....Or did not put it incorrectly. I'm pretty sure that's where General Motors is still placing them. Towards the front of the car Passenger side underneath the Dashboard pad.....In any event, if it were me, before I took it back to the dealer, I would disconnect the positive battery cable for about 20 minutes and then reconnect it and see what happens with respect to the navigation.

Also I know the first time you tried it after the repair the navigation was not working, but could you say when the last time prior to that it was utilized? Just asking because I guess there is a possibility that the navigation stop working before you brought it in but you just didn't know about it. We probably only try to use the navigation may be once or twice a month, so if it wasn't working for me, I really wouldn't know when it stopped working.....