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分析了东风4型机车热风机在使用中经常出现散热器不热、吹冷风的原因。介绍了在热风机散热器上部安装直立式自动排气阀的改进措施，采用该措施后取得了良好效果。还对热风机所存在的问题向生产厂家提出了改进建议。
The reasons why hot air blower of Dongfeng 4 locomotive is not hot and blowing cold frequently are analyzed. The improvement measures of installing upright automatic exhaust valve in the upper part of the radiator of hot air blower are introduced. Good results have been obtained after adopting this measure. Also on the problems of the hot air blower to the manufacturer made suggestions for improvement.