Hi! I'm a newbie. I just bought a 2007 Maxima for my daughter. Today we discover that it won't blow any hot air. We got it to blow hot air briefly, but only once. Is anyone familiar with this happening and a typical cause? I doubt it's the heater core.

 

First guess would be the blend air door actuator. If you know the heater core is getting water, then it's likely not opening the heater core side of the airflow. So either a stuck door, or broken actuator.