Dash Fan/Blower Issue - Jeep Wrangler Forum
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > TJ Jeep Wrangler Forum > TJ General Discussion Forum

Join Wrangler Forum Today


Reply
 
Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 04-12-2012, 03:12 PM   #1
Jeeper
 
jeremytbjones's Avatar
 
Join Date: Apr 2012
Location: Portland Oregon
Posts: 45
Dash Fan/Blower Issue

I have an issue with my 2002 sport. No matter what I change my direction control(Foot, Defrost, face, etc..) to it always blows out the top and side vents. It seems as though its stuck on one setting even though the knob moves normally. I've pulled the dash apart and made sure all the vacuum tubes are seated on the back of the knob plate(?). Any ideas? Anyone ran into this? Thanks in advance.

jeremytbjones is offline   Quote Quick Reply
Old 04-12-2012, 03:18 PM   #2
Newb
 
joerake's Avatar
 
Join Date: Aug 2011
Posts: 14
Did you check the hoses on the other end. Could be no vacuum or the lever that the vacuum moves to put it in a different position could be broken.

joerake is offline   Quote Quick Reply
Old 04-12-2012, 04:53 PM   #3
Member
 
Join Date: Feb 2011
Location: Central Louisiana
Posts: 613
Look on rear/driver's side engine intake manifold to see if little vac line fell off full time vac fitting. It so, stick it back on and tie wrap it tight....It's common problem and my 2002 TJ experienced it right after I bought it used.

If not fallen off, then trace small vac hose all it's length back to firewall and across to passenger side where it disappears under battery then goes into passenger compartment...your directional flapper door operates off engine vac and will remain stuck in whatever position it last was when hose breaks or falls off...the dash knob is a vac port selector switch that engine vac hose connects to, so as last resort, pull it out and trace to and from it.
2002TJ is offline   Quote Quick Reply
Old 04-12-2012, 05:01 PM   #4
▄▌ee▐▀

WF Supporting Member
 
Hardermods's Avatar
 
Join Date: Jul 2009
Location: Kansas
Posts: 1,316
Your problem is most likely under the hood not at the controls.

I would pop the hood and look on the drivers side right below the throttle body. Connection 5 usually is the source as it comes loose and falls of the nipple at the intake.

If that is connected then you can follow the line from there, across the firewall to the box (number 8) which is in the frame right below the battery. Sometimes battery acid corrodes the tubing there, simply pull it off then put a new piece on.

This connection is actually easier to see if you lay under the Jeep right behind the passenger front tire and just look up along the frame/firewall.






But my money is usually on the intake port (number 5), if it is the problem I would put it back on the ziptie it to hold it tighter.
Hardermods is offline   Quote Quick Reply
Old 04-12-2012, 05:03 PM   #5
Jeeper
 
jeremytbjones's Avatar
 
Join Date: Apr 2012
Location: Portland Oregon
Posts: 45
Awesome! I will check under the hood, thanks for the ideas, I'll post back with results.
jeremytbjones is offline   Quote Quick Reply
Old 04-12-2012, 06:51 PM   #6
Member
 
Join Date: Feb 2011
Location: Central Louisiana
Posts: 613
Quote:
Originally Posted by Hardermods View Post
Your problem is most likely under the hood not at the controls.

I would pop the hood and look on the drivers side right below the throttle body. Connection 5 usually is the source as it comes loose and falls of the nipple at the intake.

If that is connected then you can follow the line from there, across the firewall to the box (number 8) which is in the frame right below the battery. Sometimes battery acid corrodes the tubing there, simply pull it off then put a new piece on.

This connection is actually easier to see if you lay under the Jeep right behind the passenger front tire and just look up along the frame/firewall.






But my money is usually on the intake port (number 5), if it is the problem I would put it back on the ziptie it to hold it tighter.
YUP!
2002TJ is offline   Quote Quick Reply
Old 04-15-2012, 02:09 PM   #7
Jeeper
 
jeremytbjones's Avatar
 
Join Date: Apr 2012
Location: Portland Oregon
Posts: 45
that did the trick! it was number 6 on the diagram, its working like a charm now. thanks!
jeremytbjones is offline   Quote Quick Reply
Old 04-15-2012, 04:01 PM   #8
Jeeper
 
BigDog21's Avatar
 
Join Date: Jan 2012
Location: Central Ohio
Posts: 402
Mine switches to defrost when I hit 60 mph. I guess I should check the same vac line?
__________________
It's my daily driver, if it breaks I'm screwed.
BigDog21 is offline   Quote Quick Reply
Old 04-15-2012, 05:16 PM   #9
▄▌ee▐▀

WF Supporting Member
 
Hardermods's Avatar
 
Join Date: Jul 2009
Location: Kansas
Posts: 1,316
Quote:
Originally Posted by BigDog21 View Post
Mine switches to defrost when I hit 60 mph. I guess I should check the same vac line?
Yeah I would follow the same line, check for cracks in any of the fittings. I think usually when it switches while driving its a slight crack somewhere. The purpose of the box at number 8 is to hold reserve vacuum pressure for when your driving it helps maintain a steady pressure of vacuum. I would probably start with checking the line coming out the side of that box.
Hardermods is offline   Quote Quick Reply
Old 04-15-2012, 05:29 PM   #10
Jeeper
 
RUBI 4 MY MRS's Avatar
 
Join Date: Feb 2011
Location: California/Nevada
Posts: 1,315
BigD, Check the reservoir (#8) for leaks like a pin hole from the battery acid & its connection to the vac line, then check the one-way check valve(s)(#2) to make sure they work only one way. When you accelerate or are at high speed the engine vacuum drops. The reservoir stores vacuum for those situations & the check valve(s) keep it from escaping back through the manifold.

__________________


'05 Rubi TJ Unlimited
'93 Toyota 4Runner
RUBI 4 MY MRS is offline   Quote Quick Reply
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Jeep Wrangler 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:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

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

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 Off
Pingbacks are Off
Refbacks are Off




» Featured Product

All times are GMT -5. The time now is 10:47 PM.



Jeep®, Wrangler, Liberty, Wagoneer, Cherokee, and Grand Cherokee are copyrighted and trademarked to Chrysler Motors LLC.
Wranglerforum.com is not in any way associated with the Chrysler Motors LLC