The air conditioner heater of Longgong forklift uses a blower to blow the heat of the small water tank to the cab, so it is necessary to control the distribution of cold and hot air to make the heat of the small water tank radiate. This will warm the car. You need to reach a certain gear to drive. If the knob is set to the warm air position, the air volume is large enough and the wind direction is normal, and the cold air is blown out, check whether the cable of the hot and cold air control flap in the warm air box falls off, whether the warm air impeller is damaged and whether the flap falls off.