Will the water tank be hot without circulating warm air?

No, according to the relevant data of automobile warm air, if the warm air is not circulated, the water tank will not be hot. Automobile water tank, also known as radiator, is the main part of automobile cooling system, and its function is to dissipate heat. The cooling water absorbs heat in the water jacket, flows to the radiator and dissipates heat, then returns to the water jacket and circulates continuously.