Hi guys
My question is maybe stupid
I have a problem with my 2007 F150 5.4 3V.
Is it possible that there is a vacuum line in the dashboard to operate the heating or air conditioning system?
When my engine is idling I can hear a hissing sound in the passenger side dashboard.
If I push the throttle a bit, the whistle disappears.
I hear an aspiration at this place when the intake manifold is in vac.

Thank you for your opinion.

 

deleted by poster

 

 

A real problem area around the intake manifold runner control . Which is almost under the dashboard but in the engine compartment . I think you need to run a homemade smoke machine, see you tube .

 

Thanks for the correction Techrep. I'll remove my post.

 

Okay thank you so much.
I still look in the dashboards. But I did not find any empty lines.