Abstract: An automobile air conditioning system comprises generally a regenerator, a segregator, a condenser, an evaporator, an absorber, a heat exchanger and a plurality of conduits intercommunicated therein between to form a circulation system producing cooled air. The improvement of this disclosure is characterized with the adaptation of a coil tube wound around the outer periphery of an exhaust pipe and utilizing the residual heat of the waste gas expelled from the engine to vaporize the liquidized refrigerant NH, instead of a compressor. In addition a tubular network is provided to utilize the heat from the sun which is collected on roof and bonnet panels, to strengthen the capability of cooled air production. This invention would release the load of a compressor from the engine and achieve a savings of energy.