There are two things that are highly likely. There are also other issues that may be going on, but I will only mention the highly likely ones right now.
1st - Since you hear a gurgling, I would suspect that the heater valves are staying partially open even when the heater is off, and then closing later, or just not fuctioning properly at all. That would cause the AC air to warm up since the heater core is in front of the evaporator. (I had this problem not long ago)
2nd - I would suspect the AC evaporator expansion valve - it is what opens and closes the evaporator, etc, etc. I had this problem too. Very annoying. Replacing this part requires having a shop evacuate the system, though - as it is illegal to vent any type of refrigerant into the atmoshpere.
Good luck finding out the problem