Hello everyone, I got a yellow light bulb “cooling system error” when I checked the diagnostics I received an error P00B7 (thermostat or closed / locked vacuum valve) I replaced thermostat and also saloonid and tested vacuum. What could be the problem? It is important to note that one radiator hose is very hot and the other one is heating up a bit ... can a water pump or temperature sensor be wrong?

 

What year?

Sounds like a Change Over Valve (COV) issue. There are several COVs. Common failure.