The AC of my Sienna 04 works great but all of the sudden starts blowing hot air.

What is your question?

The AC works very good sometimes, it gets really cold, but all of the sudden it stops blowing cold air and it seems that only the fan is running.

What makes this problem better or worse?

Is kind of weird because it works whenever it wants, I could be driving for a while and it stops working but sometimes when I just turn on the car.

How long has your 2004 Toyota Sienna had this problem?

Few months