2007 Expedition vacuum line front end?

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Hey guys! A few weeks ago I developed a humming noise on my front driver side. I then crawled under and noticed 2 vacuum lines, 1 from the passenger side and one from the drivers side both meeting to the middle with nothing connected to them. They both have the flared type ends looking like something is supposed to connect them together possibly? I’m not too sure... for now I just inserted a small piece of blue tubing that I had laying around but it still not get rid of the humming?

Can any of you guys send me a pic of what yours looks like underneath?

I do have 4x4.

C3-B0-A4-EA-33-A7-4-A07-9365-8055-F50-DADD0.jpg
 

mnachreiner86

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Hey guys! A few weeks ago I developed a humming noise on my front driver side. I then crawled under and noticed 2 vacuum lines, 1 from the passenger side and one from the drivers side both meeting to the middle with nothing connected to them. They both have the flared type ends looking like something is supposed to connect them together possibly? I’m not too sure... for now I just inserted a small piece of blue tubing that I had laying around but it still not get rid of the humming?

Can any of you guys send me a pic of what yours looks like underneath?

I do have 4x4.

C3-B0-A4-EA-33-A7-4-A07-9365-8055-F50-DADD0.jpg

That’s the the vacuum harness for the 4x4 IWE system. Vacuum is applied in 2hi causing the IWEs to not engage the wheel hub and released in 4x4 causing the IWEs to engage the hub. The humming you’re hearing is the IWE trying to engage because of the leak in the line. You need the appropriate vacuum connector to repair the harness and you’ll be good to go after repairing the leak.


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NIGHTLIFEphantom
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That’s the the vacuum harness for the 4x4 IWE system. Vacuum is applied in 2hi causing the IWEs to not engage the wheel hub and released in 4x4 causing the IWEs to engage the hub. The humming you’re hearing is the IWE trying to engage because of the leak in the line. You need the appropriate vacuum connector to repair the harness and you’ll be good to go after repairing the leak.


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Any idea what the connector should look like or a part number or possibly a picture?
 

mnachreiner86

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Any idea what the connector should look like or a part number or possibly a picture?

You can get a tight rubber vacuum connector that will keep it from leaking down or purchase the entire vacuum harness. I’m not sure if Ford makes sells that piece individually but I could be wrong.


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tommyddsr

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Here is a picture of mine (2009). As you can see there is a rubber coupling. It is thick rubber and the vacuum lines are glued in. I did not trace the other ends.

PXL_20210420_212716646.jpg
 

tommyddsr

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It looks like you need the whole assembly since the setup is glued at the factory. Only $50 on Amazon for OEM lines.
 

Bigfishfin

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That’s the the vacuum harness for the 4x4 IWE system. Vacuum is applied in 2hi causing the IWEs to not engage the wheel hub and released in 4x4 causing the IWEs to engage the hub. The humming you’re hearing is the IWE trying to engage because of the leak in the line. You need the appropriate vacuum connector to repair the harness and you’ll be good to go after repairing the leak.
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This brings up a question I have had regarding a work around if the vacuum lines fail for some reason. In that case, can't AWD or 4WD be activated so that the hubs do engage and not be damaged until the IWE system can be repaired? PS: I admit to being ignorant as I have never had my IWE system fail and therefor have never worked on it. Just trying to be proactive. Thanks!
 

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