Vents and heating question

[celeryman22]

The passenger side floor vent (cowl?) is in the open position with the car off. How do these things work? What will make it close? ie. turning what climate control setting?

Thanks
Cel

PS. carpet looks good, going back together nicely.

 

[Bob Chadwick]

I spent a lot of time on this issue over the last couple of years and have written up my experiences on a web page on heating, ventilation and air conditioning.