Ford Ka thermostat

Good to everyone, I will give you more information, because today I have opened the hood and I have seen something. The KA is 99 with 1.3 60 hp engine, when I have opened the thermostat lid I have seen that the Board is burned and has a lot of dirt and that is why I think it has been stuck, what I do not know is like removing it once it is stuck. Thank you all for your comments

I would exchange everything because of what I have working in the workshop, those bodies are of very poor quality and sooner or later they rot and it starts to lose water, I recommend that to you.

I check the radiator in your case if you say that it is very dirty.