Seat Cordoba 99 problem

The other day I suffered a warm because I lost the water plug and the circuit was emptied to call the crane such and which and the next day the circuit is hoping with the hope of not having burned anything the case is that everything goes normal but the case is the needle of the temperature that once it has risen to 90º it stays a little there until it begins to heat up, it goes back 10º and it comes back to it again again and it goes back again and it comes back to it again again and it comes back to it. And so several times any of them rises and stays there with more temperature than normal but stabilized I hope it is not very serious.
thank you

Or you have air in the cooling circuit and it does not finish purging (look to see if a continuous water flow comes out in the expansion vessel with the engine at hot idle).

Or you have the chungo thermostat and it does not open as it should with what the water does not pass to the radiator and the engine is heated more than the account.

Or the water pump has broken with what the water does not circulate and only moves by convection.

Or worse, you have burned a butt joint and what happens is that the gases that escape are the ones that cause you the "bubbles \" and make the gas butt be filled preventing the water from refrigerating it (that's why the temperature ranges first and then ends up raising much more than the account).

To find out what really happens, the first thing is to fill the cold circuit to the normal level.

Put the cap and make sure that it does not lose water anywhere or there are traces of antifreeze or anything comes out of the cap, (if it is new and well placed it is everything said).

Then start the car and keep it accelerated at about 2000 rpm. Every 30 seconds look how the temperature needle is in the box and touch the sleeve that leaves the thermostat to the radiator. There will come a time when the sleeve goes warm to burn that you shit (there has opened the thermostat and start circulating water to the radiator). At that time the radiator also goes to heat a lot.

This should happen when the needle leaves the blue zone and goes for the first line.

If the needle rises to half or more and the radiator and the sleeve are still cold, because either you have the chungo thermostat or the water pump does not move (but you would have a leak that you shit with water under the engine).

If the engine goes well, the sleeve is heated as I have told you and jumps the electro well, and a continuous splash comes out through the fine tube in the expansion vessel, in principle everything is correct.

It would only be necessary to check in that case if the sleeves get hard like the picha of a boyfriend when the motor takes operating temperature and see if bubbles mixed with the splash of water in the expansion glass. If this occurs, it is an unequivocal symptom that the butt joint is burned and that is why the engine is heated more than due.

A question, the expansion vessel water had black fat floating? If so, Chungo, because that happens when the Board is burned.

Go letterpace!

All the best.

If the radiator and the electro jump burns, what I have proven is that the level of liquid in the expansion vessel rises a lot almost to the plug and then low goes up I suppose that it is normal that something goes up but almost to the plug? I think that joer is going to be that I put in and do that do that more or less its cost? I understand that expensive.
thank you so much