This is what I did the first time, the hose from the radiator to the expansion tank and the one from the cylinder head to the expansion tank.
I found the entrance to the expansion tank on the cylinder head hose blocked and the one on the radiator, the air was difficult to circulate through it.
I changed both, I cleaned the expansion tank but the result is the same. I have to check the radiator, the water pump and the thermostat are good.
As a finding, water does not circulate through the radiator. It is warm at the top and cold at the bottom, although there are times when it heats up from top to bottom.
I checked the other hoses, the route through the oil cooler
transmission, the pump drive belt does not slip.