Ac air issue in caravan

I have a 2007 SXT grand caravan. AC is normally pretty good. I would start with the charge and high and low pressures. They have to be perfect. I am going from memory, but the low side should be between 25 and 45 lbs. I forget the the high. 180 comes to mind. When perfectly charged, the compressor runs very smooth. If yours is cycling on/off every 5 or 10 seconds, then they system is over or under charged. Another issue that seems to go unnoticed and might be your issue is the condenser. If it is not cooling the freon or has hot spots, that will be the cause of hot and cold air that you are feeling. Make certain it is clean and free of bugs on the exterior. A stuck expansion valve, or debris in the system will contribute to poor air. But you can detect all that by high and low pressures. Dont just charge the system with freon or leak/die unless you have a set of gauges. Harbor Freight has a nice set for about 60.