An easy test for compressor function is to set the ACC to max cool, high fan and get under the hood and remove the two leads from the low pressure switch at the engine side of the receiver/dryer. Short the two lead together with a short piece of wire or a pigtail. I am talking about the spade wire ends you just removed, not the switch lugs. If the compressor comes up when you short the two leads and doesn't make any weird noises, then the best bet is you've lost your refrigerant charge. Which means you have sprung a leak somewhere and that is your main problem. If you don't get the compressor coming on, then there is a control problem which you will have to troubleshoot. Let us know..

__________________
Jeff Lawrence
1989 300e
2000 Dodge Grand Caravan SE
No matter what you fix, there will always be something else to fix..
"Warranty" is just another way of postponing the inevitable.