Air conditioner system

Estimated senhores.
They could help me with the following doubt.
My car is a Toyota Hilux 2008, one day ago it is presenting me problems with the refrigeration
when I turn on the car and I cool well but suddenly turns off the compressor and I have to stop the A/C key of the board so that it works again.

The normally cooling at the same temperature, I have ruled out that it is lack of gas and oil inside the pipelines.

My question is how I can locate the real fault of this problem and how could I solve it?

Thank you

From what you say it can be the problem of the changing button and test are not expensive and for the test you can occupy any alternative button that they sell and be economical, it may be heated and disarmed or disarmed by vibrations.

Friend the problem was a resualto as follows.

It was tube that replace the clutch, it was had to change the evaporator filter and change the valbule.

Now if you cool the beers well.

Thank you.