Air Conditioner problems of the 2000 Dodge Durango

Air conditioner not cooling when 85 degrees or hotter. When set to max ac, only get cool or warm air. The vehicle is a 2000 with only 50,000 miles on it. I have had it back to the used car dealer and they say everything seems to be working properly.

At 32,000 we had severe shaking while applying brakes . We took our truck in to have it looked at, shop said that front brake rotors were bad and had to be replaced, they could not be turned . Had them both replaced with after market rotors . A/c clutch assy replaced at 39000 , at 40000 miles we noticed a groaning and sqeaking noise coming from the drivers front wheel when exiting the vehicle ,and noticed an oily substance on driveway under truck . We had both problems looked at , found 4 bad ball joints 1 needs replacing imediately, also rack and pinion seals are bad . Est. $1700. 00 to repair joints and rack. Ball joints are sealed and cannot be greased , they should last alot longer than 40000 miles .

Air conditioner is blowing freon into cab of vehicle. Very dangerous. Please provide any further information.

A/c intermittently not cooling - only keeping cab at 85 degrees when 90-95 outside.

Air conditioning blows out hot air. Never has been that cold. Rear end has a howling noise between 45 and 55 mph.