Air only blows out of vents when the defrost button is selected 1997 Maxima
Blend door actuator module under the dash...
Where under dash, what side or in the middle and is that the actual part name?
It is an electrical part that controls the direction of air flow by your selection. Some are called AC blend actuator module, Blend door actuator module. I got mine at the locale parts store, probably on yours it would be located more in the middle under the dash, if you can follow the main air intake vent from the fire wall to where the heat comes out onto the floor you should find it along the way. An experienced parts guy can tell you exactly where it is.
Looking for a Used Maxima in your area?
CarGurus has 24,517 nationwide Maxima listings starting at $999.
Search Nissan Maxima Questions
Are you a UK consumer? CarGurus now has a discussion forum in the UK.
Nissan Maxima Experts