air conditioner blows cool for a while them warmer

I have paid the dealership more than once to repair my air conditioner and the problem continues. The summer is over but before next summer, I will have to spend more money in order to have cold air for the spring/summer of 2017. NISSAN should recall vehicles for this problem as it is wide-spread and very frequent. My vehicle has less than 100,000 miles and the problems never stop.