How often should vehicle air conditioning refrigerant be replenished?

[DianaRose]

Automobile coolant should be replenished every two years or after driving 40,000 kilometers. The following is an introduction to coolant: Precautions for antifreeze replacement: Antifreeze coolant can be replaced either at a 4S shop or by yourself. However, drivers should note that engine antifreeze coolant is available at 4S shops or auto parts stores. There are two specifications: ready-to-use and concentrated. The ready-to-use type can be directly poured into the radiator. Functions of antifreeze: It provides anti-corrosion protection for components of the cooling system; prevents scale formation to avoid reducing the radiator's heat dissipation efficiency; ensures the engine operates within the normal temperature range.