Vacuum Problems - Ford Powerstroke Diesel Forum
LinkBack Thread Tools Display Modes
post #1 of 2 Old 04-12-2012, 11:16 AM Thread Starter Rookie
Join Date: Apr 2012
Posts: 3
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
Question Vacuum Problems

So I'm trying to solve a vacuum leak problem I've had since I got the truck a couple months ago.

When I bought it, the ESOF did not work, but the HVAC could select any vent hot or cold and worked.
In my attempt to fix the ESOF, I replaced all the lower vaccum lines (that go to the hubs) and still had a vaccum leak. I figured it was the hub orings and put off working on it until it got warm.
However, a couple weeks ago, I lost the ability to control my HVAC. Anything I put it on defaults to defrost with the exception of FLOOR ONLY which works as intented I believe. So to try and troubleshoot this, I first checked the vacuum pump. The resistance on the plug was not quite to spec, but when hooked up to nothing else (completely plugged from HVAC and ESOF), it held vacuum and ran with the key to ON. So i got out the mighty vac and noticed that when I pull vacuum directly to the HVAC line (the one that goes thru the firewall i think) it doesnt hold vaccum. Where does this line go and is it replaceable? Is it supposed to seal up and hold perfect vaccum? Im guessing I'll have to tear the glovebox out and try and find it. Any suggestions, experience, drawings that will make this less difficult? I havent heard of anyone having a leak anywhere but the hub lines, what gives? Thanks!!!
ford73power is offline  
Sponsored Links
post #2 of 2 Old 04-12-2012, 11:32 AM
Compression Ignition Addict
STANGMAN893's Avatar
Join Date: Sep 2009
Posts: 710
Thanks: 0
Thanked 2 Times in 2 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
I have personally seen the metal lines that come out of the knuckle go bad and also the solenoid behind the pump go bad.Look into those.

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
STANGMAN893 is offline  
Sponsored Links

Quick Reply

Register Now

In order to be able to post messages on the Ford Powerstroke Diesel Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome