air conditioner works good most of the time and then all of a sudden, the refrigerant comes out in a vapor cloud like it,s building up pressure and some kind of relief valve is opening; I replace the fluid (till the sight glass stops bubbling) and it works ok for a while and then will do it again after a few days or so - i suspect maybe a seal in the compressor is failing, what do you think? I had it checked out by Toyota and they said everything checks out all right (till I get to FL and thats where i run into problems