2007 Honda Accord 2 door LX 5speed. One day the heater worked fine and the next it stopped blowing hot air. So, I looked online and I checked the heater valve, (removed it and physically checked to make sure it worked), flushed the heater core, antifreeze was pretty green no trash. Check the heater mix door actuator, (turned the key on go from hot to cold and back again and the door works), no leak in the heater core. It makes me think it’s a sensor the way it just stopped worked but I am at a loss.