• Register Today It's free! This box and some ads will disappear once registered!

Mystery vacuum line connection 4.0L SOHC 1997

Peanut74

Well-Known Member
Joined
November 25, 2010
Messages
110
Reaction score
0
City, State
Prattville, Alabama
Year, Model & Trim Level
1997 XLT; 325,000 miles
I have a vacuum line that I have been trying to figure out for a couple of days but no luck so I thought maybe someone on here might be able to help me out.

What I have is a 1997 4.0L SOHC that was built in 11/1996. The part I am trying to figure out is that there is a Tee fitting, located on the passenger valve cover, on the line that goes from the vacuum manifold (octopus) to the vacuum reserve (baseball looking thing). The problem is I have looked all over and see no signs of a missing vacuum hose or someplace a vacuum line should connect to.

As near as I can tell the mystery line is not for the "max A/C" heater solenoid and it not the one that goes to the vent control. I have even been checking at the various junk yards and have yet to find one with this tee fitting on the vacuum line.
 


Join the Elite Explorers for $20 per year. Gets rid of the ads! New $5 per month "try out" option.

Explorer Forum has probably saved you that much already, and will continue to save you money as you learn how to diagnose fix problems yourself and learn which modifications work without having to experiment on your own. Elite Explorer members see no advertisements, no banner ads, no double underlined links, can add their own profile photo, upload photo attachments in all forums, and Media Gallery, create and save more private Conversations, and more. Join Today. Your support is greatly appreciated.




snoranger

Explorer Addict
Joined
February 28, 2007
Messages
2,369
Reaction score
12
City, State
Jackson, NJ
Year, Model & Trim Level
94 limited on 35's
That line usually has a straight fitting in it. Maybe someone broke it and swapped in whatever they could find.
 




Peanut74

Well-Known Member
Joined
November 25, 2010
Messages
110
Reaction score
0
City, State
Prattville, Alabama
Year, Model & Trim Level
1997 XLT; 325,000 miles
That is what I was thinking but wanted to be sure. Tracing the vacuum lines is next to impossible because of the way they are run.
 




bill06447

Well-Known Member
Joined
April 13, 2013
Messages
613
Reaction score
2
City, State
Connecticut
Year, Model & Trim Level
1997 Explorer XLT 5.0 AWD
Have you looked at the vacuum schematic that's under the hood? (passenger side)

Bill
 




Peanut74

Well-Known Member
Joined
November 25, 2010
Messages
110
Reaction score
0
City, State
Prattville, Alabama
Year, Model & Trim Level
1997 XLT; 325,000 miles
Yes, I did look at it and tried to trace out the lines but it didn't make any sense to me because of all the abbreviations. The other reason is that my vents quite working at about the same time. I went ahead and plugged the line in question I then checked all the lines and after I reversed the lines on vacuum reserve tank everything is now working.
 




Peanut74

Well-Known Member
Joined
November 25, 2010
Messages
110
Reaction score
0
City, State
Prattville, Alabama
Year, Model & Trim Level
1997 XLT; 325,000 miles
Well looks like the straight was replaced by a T fitting. I made all the connections the way I believed it should be and everything has been running.
 




Top