My wife comes home from work the other day and complains that the car never cooled down on the ride home. I start it up and hot air is coming out of the vents so I pop the hood. I can hear the compressor short cycling, I put a set of gauges on it it and it is shutting down because of high pressure, I am guessing something isn't opening in the lines so I make an appointment, we have to wait until Monday morning to drop it off at the Cadillac dealer that handles Saturns. This morning I start the car to check it out and same problem, short cycling but cooler air is blowing out of the driver side and really hot air out of the passenger side. Now the car has only been running a minute or two so there is no way the engine is hot enough to blow heat, I am guessing there is a reversing valve gone wrong and the AC is producing heat, like a house heat pump? Just grasping at straws since I am not a mechanic. Any ideas out there?