T394 air vents

[den75]

On a T394 with cab, there are 4 intake vents towards the back of the tractor in the cab. 2 on the rear up top and 2 on the side up top. Should these be opened or closed to allow for air recirculation in the cabin without pulling in outside air.

Thank you

 

[Digityman]

Good question. I just saw a little sticker on the headliner about that. Does yours have the sticker that says it?

 

[den75]

Good question. I just saw a little sticker on the headliner about that. Does yours have the sticker that says it?

No, no sticker on the headliner. What does yours say?

 

[Digityman]