The first thing is to start with the easy.
Pressurize the cooling circuit with the cold engine. To do this you have to look for a rubber cap that airtight closes in the expansion vessel or modify the car cap (and look for another new cap).
By pressurizing the circuit, as the partner (0.5 bar as much) says, we will know if the water is going for some leak or sleeve. As the engine is also cold, the water does not evaporate when it leaves or can burn us if the cap jumps.
On the other hand, it must be verified that the rest of the circuit components are fine,
the water pump will have to be disassembled from the engine, check that the pump rotor does not present wear or breaks, that the press (water checkpoint) does not lose, that there are no jolgures on the axis, that it does not lose the pump joint ... (and if you mount a new pump it would be the best, but the money is the money).
The thermostat will also have to check it and if it works to leave it on the engine. To do this, it is enough to put it in a saucepan with water and put it to heat to the fire with a thermometer, when it reaches the temperature marked in the sheet (82ºC normally) the valve will begin to open and on the 90 or 92 it will be totally open. When taking the thermostat and putting it in cold water, you have to close immediately.
The thermostat reduces consumption considerably since while the engine is cold, it does not allow the heat it generates to go to the radiator ahead of time.
If you remove it, the low motor yield, the cylinder head is filled with carbonilla for burning gasoline below the service temperature for a long time.
Another thing to check, is the expansion vessel pressure relief valve, since sometimes it is open or seized, and the circuit does not take pressure, so that the water boils when it reaches 100ºC, steam bags are formed in the butt and it goes through the cap of the glass. Which leaves us without water, and with an excess of temperature.
Checking the cap is complicated, because you would have to put it in the glass and put pressure on the circuit with a pressure gauge ... the easiest and not very expensive is to change it.
All the best.
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