Excuse me, what is the reason why Qichen M50V air conditioner can't produce warm air?

1, the cooling system is short of coolant. Coolant is commonly known as antifreeze, from which the warm air of automobile air conditioner comes. The principle is different from that of household air conditioning heating. Automobile warm air circulation is to connect a pipeline in parallel in the small circulation pipeline of engine coolant, which is connected with a warm air water tank, and the blower blows the warm air water tank to generate warm air, which is how the air conditioning warm air comes from. Does the lack of coolant in the cooling system lead to warm air?