When the outside temperature is below freezing, the heater runs for about 10 minutes and then starts blowing nothing but cold air. This is not just an inconvenience and discomfort, but leads to distracted driving which could result in an accident. Lately the temperature has sometimes dipped below 0 degrees F, and the car is almost undrivable. This problem has been widely discussed on the Leaf owners’ forum online and was just acknowledged by my service representative at Valley Nissan in Longmont, CO. There were no warning lamps or other indications of the problem before or after.