Sucking sound inside from rounded metal disk below glove compartment

[gaylon]

Any idea what this is? Looks like it is coming from the vacuum line off of the distributor (which I just replaced yesterday) in through the firewall to a rounded metal object that is mounted on the firewall below the air conditioning equipment. I can post a picture if needed. Any idea what the disk is for and why it might be making this noise now?

 

[Butt Ugly Chuck]

That line's to supply clean air from your cab to vent your dizzy and keep it dry and happy. I don't think mine makes any noise, but I've never listened for it near the glovebox.

Butt

 

[RockDoc]

x2, that's what I am thinking.

 

[gaylon]

There is no missing this noise. It is a very distinct hiss. If it supposed to be there, than I will check the line for partial obstruction. That is what it sounds like.

 

[FJ40Jim]

It should not make a noise. Normal airflow through it is very minor, not audible.

The VCV that controls dissy cap ventilation is suspect. Either failed or wired incorrectly.

 

[gaylon]

Thank you, Jim. I will try to identify the VCV.

 

[gaylon]

The system was incorrectly hooked up - I screwed it up after replacing the distributor cap. I got it all hooked up now and it is running better.