[Albertstreet67]

So I have a problem with the nob that switch from fresh air out side to in side air. I have the ac off and no matter with one I hav it on it blowing air any suggestions plz

 

[gump1114]

If it is set to not recirculate, you will feel air coming through the vents when driving.

 

[Albertstreet67]

If it is set to not recirculate, you will feel air coming through the vents when driving.

it don’t matter wich one I have it on I still feel air coming in.

 

[T4EaterJonny]

I think there's a vacuum line back there or a cable that can become disconnected. I forgot to put it back on when I replaced my heater core. You just have to take the vents off, gray bezel, and hvac stuff off and look back there.