What happened when there was no warm air at Fameilai engine temperature 100?

First, touch whether the warm air inlet and outlet pipes are all hot. If not, the engine circulation is blocked or the heater box is blocked, and the water pump may not work. If the intake and exhaust pipes are burned, it is that the control cable of the cold and hot air baffle in the middle of the instrument panel is disconnected, or the windsurfing board is broken. You can see it by removing the glove box. I come from Haima 4S shop.