On this study, fan less air cooling system that use air inflow naturally driven by the high pressure on the front head lamp during driving and the radiator fan during idle was developed for the LED head lamp. The tube and duct let the inflow air from the inlet grille on front of headlamp to be separated from the air head lamp inside. It makes sure not for contamination and fog up on lens of headlamp. The duct and heat sink were made of one aluminum body to increase the heat transfer area and the rubber tubes were flexible enough for the headlamp aiming movement. The hose connected to radiator fan shroud was 30mm diameter for suction during idle. As a result, the fan less air cooling system could cool the led lower then 102℃ during both idle condition and driving. It shows the new cooling system can make the led headlamp system cost down.