Sail, what happened to the warm air?

This situation is that the coolant circulation is not smooth and the heating box is blocked.

1. Poor circulation of coolant: heat cannot be transferred to the heating box normally, which affects the heating effect. You can check the level and color of the coolant to ensure smooth circulation.

2. The heater water tank is blocked: this will hinder the heat transfer, resulting in the heater not being hot. You can try cleaning or replacing the heater water tank to restore the heater function.