Air Conditioner Problems of Chevrolet Uplander

I bought a 2005 chevy Uplander, already went through the bbb auto line regarding the unacceptable temperatures in the car (even after running ac on maximum for 30 min plus) of 85 degrees to 95 degrees. Which are unacceptable to me and I have had a very close call with my dogs, that travel in crates in the back several times due to the heat in the car. During the arbitration hearing Chevrolet (mr. Nader, richmond ky) did not dispute the hot temperatures in the car, the ac is designed to never blow out colder air than 43 - 48 degrees after running for about 30 min and standing still 50+ degrees temperature, yes, the back is hotter, as the pipes for the rear ac go through the roof and the roof in the summer will get 110 to 130 degrees easily. But there is no fix for it. My question is, ky is not one of the hottest states, however, we had a hot summer and still do have 90 degrees days not, what about people traveling for several hours, someone could die in the back, as the front does not realize that the back is not working sufficiently. Please check into this before someone gets hurt by this through the negligence of Chevrolet. Your help would be so much appreciated.

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