I HAVE A FORD EXPEDITION 2001, AND I AM HAVING PROBLEMS WITH THE AIR CONDITIONER. I HAD A NEW COMPRESSOR PUT. IT WORKED FINE FOR AWHILE, THEN THE ENGINE LIGHT CAME ON, IT STARTED BLOWING HOT AIR, AND IT STARTED SKIPPING.
Sound like your fre leaked out, indicating that there is a leak in the house/line somewhere. Just to be sure, purchase a can and fill it while the car is running and your AC on. If it get cool than hot, my assumption is correct. This would be the worst case, however, if it stays cool that they did not fill it when the compressor was replaced. Good luck and let me know if you need anything else.