Cooling system expansion tank question

[Wigert]

Hello all

Could someone please help me understand if my cooling system is working as it should. More specifically if the termostat in the refill lid is working and the expansion tank doing its thing.

The reson why is that no matter if the car is warm or cold the level in the expansion tank seems to remain at cold. The temperature of the coolant there also seems to be cold. Also, sometimes I have needed to add a small amount of coolant in the main reservoir to top it of up to the exanpsion system hole. I tested and blew air into the expansion hole and it bubbled in the expansion tank so there is no restriction there.

Is there something I am not understanding here or do I have an issue? The thing that bothers me most is that I may need to top of the reservoir eventhough the level in the expansion tank is good... Also, there are no leaks that I have seen so far.

Thanks in advance guys!

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