Kedah 4x4

When driving on dusty roads, its a good idea to have all your windows closed and the ventilation control set to outside air with the fan on high. This pressurizes the vehicle interior slightly and helps reduce the amount of dust sucked into the vehicle. When another vehicle approaches, move the ventilation control to "recirculate" to stop dusty air coming in. Remember to move the ventilation back to outside air once you have passed through its dust trail or else the pressurization effect will be lost. In hot weather, vehicles without air-conditioning have to make a choice between minimizing dust intake or winding the windows down for the (cough) fresh air.