Just came back from work, checked the coolant level directly in the radiator. The level dropped after I started the engine and I had to add 0.5L of water to bring the level back. I saw the coolant bubbling when I was adding the water. Is it normal?
I noticed 2 massive coolers on the radiator are not spinning. Could it be the reason of the overhearing and coolant expansion?
coolant bubbling:
