Cold-warm air conditioner for engineering vehicle

An engineering vehicle cool-warm air conditioner is characterized in that an evaporator bus is provided with a warm air heat exchanger and an evaporator; the warm air heat exchanger is communicated with the cooling water in an engine; the evaporator is communicated with a compressor. The warm air heat exchanger is separated from the evaporator and installed in the evaporator bus. The warm air heat exchanger, and the high-pressure pipe joint, the lower-pressure pipe joint, the water outlet point joint and the water inlet pipe joint of the evaporator are arranged at the lower part. A condenser communicated with the evaporator is installed behind an engine fan. The utility model has the advantages that the driver cab of the engineering vehicle is comfortable and reasonably deployment can effectively reduce the installation size, which can not only effectively use the limited space but also fully display the potential of the engine; cooling water helps to warm in the winter; after the condenser is arranged behind the engine fan, the whole structure is reasonably arranged, the energy consumption is reduced, the temperature change is quick, the constant temperature performance is good, the reliability is high, the maintenance is easy and the cost is quite low. The utility model is in particular applicable to the large-size and medium-size engineering machines, such as loading machines, excavating machines, road rollers, etc.