No leaks are apparent. Fluid stays full and pressurized.
Fluid only drops after the engine warms and the thermostat opens. Then it drops. Steam does roll up from the bottom if the engine once it's hot. Not sure why. But it doesnt seem to be a leak? It doesnt drop in level or pressure. It is under pressure. It seems like l might have air trapped and it may be taking several times to bleed it all out.
I dont get it.
This is its second thermostat. It acts fine for weeks after the thermostat is installed. Then 5 weeks after it suddenly over heats and acts like it has pulled air into it somehow. Then the air is trapped.