Problems with 2014 GMC Acadia VISIBILITY

We have had the car since january and i guess today was the first day i have driven the car with the back windows down. i took my dog with me so i rolled down the back windows when i did this the whole car started shaking and you could see in the rearview mirror that the back doors shook hard. the shaking made a load racket that hurt me ears. it happened with either back window down but was worst with the driver side. it was real bad with both windows down. i did not get the shaken with the front windows down and the back windows up. it only accured when the back windows were down. it happened at 65 miles an hour and at 40 miles an hour. it has to be a design flaw because it was bad. i first thought it was a bad tire but it went away with windows up and only came back when back windows were down. after making sure the tires were ok, i played with the windows to see when the vibration started and got worst. the vibration would start when either back window would get a fourth of the way down and would get worst as the windows would go down. the faster i went the worst it got. no vibration ever happened when just the front windows were down and no vibration when all windows were up. the car would vibrate enough that it scared me and i think someone needs to look into it and test drive our car thank you *tr

I was returning from a doctors appointment and stopped to pick up my son's prescription. i turned to check on my son, who just turned one on sunday, and saw his face was extremely red. i was confused because he was so warm and i had the a/c on blast. apparently the back of my new denali acadia 2014 was now only blowing warm air. i shut off the rear air rolled down the windows and fully blasted only the front a/c unit. i lived only 3 minutes away so i raced home and got him out of the vehicle. after a few minutes he woke up and started to appear his normal self. i went back out to the vehicle and retested the rear air not working. after i confirmed it i called the dealership where i purchased my vehicle. i have been looking this issue up on the internet and it appears to be quit common. without my motherly instincts and former training my son could have possibly died from heat injuries in my brand new vehicle. i am extremely disappointed that this is even an issue i have to also worry about. gmc needs to get this issue resolves before someone does lose their child(ren) to this heat issue. http://www.acadiaforum.net/index.php?topic=12405.0 http://boardreader.com/fp/gmc_acadia_forum_acadiaforum_n_9340259/problems_recalls_tsbs_faqs_links_how_tos_10202903.html. *tr