that circle at the top im low on that and it’s the coolant but im confused on what the bottom circle is and if any fluids go in there. i drive a 2012 nissan altima 3.5 liter and much help would be appreciated
that circle at the top im low on that and it’s the coolant but im confused on what the bottom circle is and if any fluids go in there. i drive a 2012 nissan altima 3.5 liter and much help would be appreciated
The metal cap is is on the radiator and maintains pressure in the cooling system. This should be “full the brim” under that cap. The black plastic cap is the overflow bottle. The idea is that when the coolant heats up and expands, it overflows from the radiator into the coolant bottle. When it cools down and contracts, it sucks the coolant back. This does not always work perfectly, however. So check the radiator (metal cap) as well as the coolant bottle. If the radiator is full but the coolant bottle is low, you are safe in the short term. However, if the radiator is low, it doesn’t matter if the coolant bottle is full… you could end up with problems due to not having enough coolant.