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thermostat is stuck shut
As the engine coolant heats up, the coolant expands, so the coolant needs a reservoir or expansion tank to flow in and out of as needed.
thermostat or blown head gasket....
There's a sensor in the bottom of the coolant expansion tank.
In the expansion tank.
how do I replace my 2005 fiesta expansion header tank
The rated coolant capacity of the whole system is 7 litres, but it might not be completely empty. The expansion tank is just the tip of the iceberg.
There shouldn't be just water in the expansion tank. If the coolant (50% anti-freeze and water) appears to be boiling in the expansion tank, you may have a bad head gasket or cracked head.
there is none. look for the coolant expansion tank there is where you add coolant to the system.
It is in the coolant expansion tank Problems with this sensor are common as they are pourous and take up coolant, eventually sinking and bringing on the coolant check light. You most likely will need to change the coolant expansion tank to cure the problem as it is usually sold as a unit. Kev
It sounds like the tank has a leak.
when the engine is stopped, the coolant stops flowing. The coolant inside the engine can boil and force coolant into the expansion tank. this is normal.