What are the symptoms of air in the radiator?

[DiJames]

The symptoms of air in the car radiator are: the engine temperature is too high, triggering a high-temperature alarm; prone to boiling over and damaging the engine; coolant may overflow during the cooling process; and the cooling efficiency will be reduced. Methods to remove air from the radiator: 1. Open the engine compartment when the car is cold and check if the coolant is sufficient. There are MAX and MIN level marks on the side of the coolant reservoir. If the level is below the MIN mark when the car is cold, add coolant according to the marks on the reservoir. 2. Inspect all connecting pipes and interfaces for cracks or signs of leakage. 3. Drain the old antifreeze, flush the liquid channels with clean water, allowing the water to continuously flow through the engine cooling system. Then start the engine and let it idle for 3 to 5 minutes to circulate the water. Continue adding clean water until the water coming out is clear. 4. To allow the antifreeze to flow quickly into the radiator, about 1 hour after draining, add new antifreeze through the radiator hose. Add another bottle of antifreeze to the antifreeze reservoir until it is nearly full. Start the car and let it run for about 10 minutes. At this point, as some air is expelled from the cooling system, the fluid level will drop. Add more antifreeze until the level is between the two marks.