The coolant system is a closed system. When the system is full the reservior acts as an expansion container. When the engine heats the coolant expands. The coolant expands into the reservior when the pressure cap releases. As the engine cools the coolant contracts and the radiator cap allows the coolant to flow back into the engine. If you are having coolant loss it should show as an external leak If there is no external leak it could be possible to have an internal leak. In theory this system should not lose anything but coolant loss on a small basis is expected. If your coolant loss is great and it is not seen externally I suggest that a pressure test involving engine components be done. I hope this can help Moe
We have coolant loss of about 750ml/trip - I know where the coolant is - it's in the expansion chamber, which is steadily filling more and more, but not getting drawn back into the radiator when the motor cools. This is an ongoing situation, which is continuing in spite of having the motor replaced (original motor blew head gasket and developed scoring on the block subsequent to the gasket blowing). Why is the coolant not being drawn back into the radiator on coo
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