We booked a limo with CLS based on hotel Aria's recommendation.  We ordered special champagne for an early birthday celebration.  We had planned on taking a trip to the Valley of fire.  The weather was very warm, 107 or so.  We called ahead of time and we were assured it would be cool in the car. The driver showed on time.  We had to drive to another part of the hotel to pick up a friend.  We were in the car for no more than 5 minutes when we noticed that the air conditioning was blowing warm air.  While driving we heard a banging noise whenever we drove over bumps. When we reached the area where our friend waited, we couldn't open the door. The driver was outside and didn't even turn around.  I had to climb out the window to open the door from outside.  Driver didn't notice a thing.  Once we had everyone in the car it became obvious it wasn't getting any cooler. We had to turn around and go back to the hotel.  The driver suggested going on the freeway to see if the car might get cooler but at that point it was hotter inside the car than out (black car).  The manager suggested to the driver that he bill us for an hour anyway but later she relented.  This company is extremely unprofessional.  It is the Aria's company of choice for no apparent reason.  Caution to anyone considering using this company.