The heater tank is blocked. The structure of the warm air water tank is actually a miniature version of the radiator of the engine water tank, and there are many small cooling pipes in it, which are as easy to block as the radiator of the water tank. After the inside of the warm air water tank is blocked, the coolant flows slowly, the flow becomes smaller, the heat is insufficient, and the air conditioner does not heat.
How to turn on the warm air
Start the engine to warm up first, don't turn on the air conditioner blower directly, wait until the water temperature pointer reaches the middle position, then turn on the air conditioner, set the air circulation to external circulation, and turn off the air conditioner switch. Wait a few minutes, and then change the loop mode to internal loop.