but in reverse. The passenger side would blow warm air but the driver's side blew cold. If your Nissan has adjustments for both driver and passenger, you might have the same problem. In the Hondas, it was a plugged heater core. I experienced this in my own vehicle. There was a technical bulletin released about this issue. The heaters needed to be flushed with CLR for a couple of hours. It worked but there's no guarantee that it won't come back. I suspect this is some kind of materials incompatibility issue between the factory anti-freeze and metals through which it passes in the vehicle.
I have 2012 nissan armada 5.6 liter heater problem. When I turn on the heater
only the driver side get hot and other side get cold. I need some one give me advice to fix the problem. I asked mechanic he charges me $800 , I do not have that much money to fix it. Thanks a lot