Hi my cold air wont work only hot air is coming out what is wrong with my ac

Could be a few things. AC system prob, low refrigerant, temp blend door, etc.... Is the clutch engaging on the compressor?

I had a simmilar problem, and that was a leak in the lines, so it only worked for a few days, then it was hot again, a pressure test of the system gave the spot where the leak was and the line had to be replaced ! otherwise I agree with Mike to solve the problem

Ask 07 s550 my ac works one day then doesn't work another day then sometimes it will not kick on until drive it about 30 mins