Hi !! Thanks for answering and happy new year. Actually, the whole grill is rather hot, as is the return pipe. I am going to take out the thermostat and I will see how to immerse the end in ice water out of the freezer to test the continuity is cut, discarding that it is malfunctioning. Thanks and I comment.
This procedure of immersing in ice is not correct, to check a thermostat, it is enough that the equipment cools sufficiently or not, to know if it works well or not from its same position, as long as it has continuity of passage through its contacts the rest depends on the temperature that is able to achieve or not the device itself. In your case it does not lower the desired temperature and does not have frost on the return, it could either be because the system needs a little more refrigerant, or the compressor has already lost efficiency, but that data would be better for the technician who could offer it .
I thought that putting the thermostat bulb at a lower temperature (put the ice from the freezer of another refrigerator to come to -08 degrees and place it in a taper, it would cut the engine). I have an unused thermostat that I can adapt (I bought it by mistake) and I see what happens, it was not to disassemble the one in the refrigerator. I'm going to call the technician and I tell him (it's really a service exchange arrangement), then I'll tell you what happened. Thank you.
Yes, I put it in position 0 (with one click, cut permanently) or near 0, cut then turn on and do not turn off. The indoor temperature does not fall beyond 8 degrees measured with thermometer. I'm waiting for the technician. I tell you what he tells me. For me it is not a thermostat subject. Thank you
All right. I made a simple can by taking the bulb directly to the freezer, I stuck it with tape to the sheet, I put it almost at 0 in regulation, and the temperature reached -16 degrees, it did not cut. Rare, I will buy a thermostat: KDF 26.1. If I succeed, I will see that of regulating an internal screw in a counterclockwise direction and see if it cuts at a lower temperature. Anyway, running continuously and weatherstrips in perfect condition, it did not go below 7 degrees. Then I comment. Thank you.
Well, I solved the problem. I looked at another YoReparo publication "https://www.yoreparo.com/es/refrigeracion/refrigeradores/preguntas/1568950/termostato-kdf-26-1-no-corta" comment from Carlos 656 from the end, and I turned screw thermostat counterclockwise 6 turns until cut. Then, with a touch up, I see that the freezer's cutting temperature is -25, in cabinet + 4.5. For now I leave it that way. Thank you very much for everything and help in the solution.