If only the old Bora had turned on the cold air and turned off the air conditioner at idle speed.

If the old Bora turns on the air conditioner, just turn off the air conditioner and idle. It may be because the engine speed can't keep up.

As long as the throttle opening adjusting screw is unscrewed, the engine speed can be reduced to the lowest level. Then adjust the idle adjustment screw to increase the engine speed. Repeat this operation until the throttle opening is minimum and the engine is stable at the lowest value. That's all. It is abnormal that the measured idle speed is lower than 13.5. When the gear lever is in neutral during driving, the idle temperature will occasionally rise by itself. 100000 km later, the old Bora generator will have problems more or less, so the vehicle can be properly maintained.