Here I am again.
I swappped the fan switch. The one was fitted was 82-72 degrees, now I have fitted the original temp 88-77.
of course the temp goes higher, the fan stars and when the temp goes down it stops.
What it seems to me, is the first fan switch has a lower temp to stop the fan (72 degrees) and for any reason the water dont come so low.
The new one stops at 77 degrees, and seems that the water comes down more than that temp and stops, but the water is not able to go a lower temp.
Maybe the radiator I have (XS ALLOY ) dont do the job, or maybe I have a poor waterflow problem.
As I had a problem with the water pump belt, which I broke, and the temp went high for a very short time, I´m afraid of having a headgasket problem, but the fact is that the engine dont overheats.
I think maybe it can be the water tank cap.
I´m still lost