99 Wrangler Sport (non AC) Air flow vent not working. - Jeep Wrangler Forum
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > TJ Jeep Wrangler Forum > TJ Tech Forum

Join Wrangler Forum Today


Reply
 
Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 01-06-2006, 12:37 PM   #1
Newb
 
Join Date: Jan 2006
Posts: 7
Unhappy 99 Wrangler Sport (non AC) Air flow vent not working.

Need a little help here... and yes, I'm a newbie. I have a 99 Wrangler Sport and the air control knob no longer seems to be working. I have air coming out, but I can no longer change between heating the floor, heating the drivers, or changing it to defrost. I'm talking about the knob on the far right of the pannel. Seems easy enough to reach through the glove box compartment but I don't know what I'm looking at.

Please help me stop my baby from fogging up!!!

bchamberlin is offline   Quote
Old 01-06-2006, 01:11 PM   #2
WF Graphics Bitch
 
JeepCrawler98's Avatar
 
Join Date: Apr 2005
Location: Tucson, AZ
Posts: 544
Send a message via AIM to JeepCrawler98
Most of the time when the TJ HVAC plenum box stops routing air it's because of a vacuum leak. Open the hood and look on the intake manifold - you will see a small hose coming off of it that goes across the firewall to the passenger side. There it Tees into two routes - one going to a vacuum reservoir located below the battery, and one going through the firewall and to the selector knob you see. Inspect the hose - and experiment with blocking off the vacuum reservoir to see if the problem is before the knob, or the knob itself. You may also want to stick a vacuum gauge on there and see where it's registering. It should be around -15psi or so (normal engine vacuum), and when you rev or stop the engine (eliminating vacuum) it should stay there as there is a check valve that should keep the vacuum in (or the pressure out depending on how you look at it) and the vacuum reservoir should last a good while unless there is a leak.

__________________
//1998 Jeep TJ {'4\"', 'TFLX LAT', 'AA HD SYE', 'HF 8000Lb', 'LockRight', 'Armor', 'Body mods', 'Misc Mods' = 'true' };
JeepCrawler98 is offline   Quote
Old 01-06-2006, 04:05 PM   #3
Newb
 
Join Date: Jan 2006
Posts: 7
Thanks, I'll check that out. I think I may have pulled something while connecting a Sirius antenna. I had the glove box off and was reaching through there to pull the wire through. The knob turns but doens't feel like it's clicking or doing anything. I seem to remember some resistence when it changed from feet to body to defrost.... maybe I'm not explaining this well.
Just keep in mind air still comes out and I control how much and the temp.. I just can't switch between the different directions of the flow.
bchamberlin is offline   Quote
Old 01-06-2006, 05:15 PM   #4
Jack Lives Here!!!

WF Supporting Member
 
1BLKJP's Avatar
 
Join Date: Apr 2005
Location: Phoenix, AZ
Posts: 7,764
If your knob just freely turns and nothing happens then the knobs could be stripped out on the inside. I had this happen to mine, the plastic insert on the back of two of the knobs had broken. I think 3 new knobs at the dealer was 20 bucks.
__________________
Thanks,
Jack Hickman

President - Arizona Off-Highway Vehicle Coalition
Vice-President - ASA4WDC
Arizona Rock Rats
1BLKJP is offline   Quote
Old 01-07-2006, 08:07 PM   #5
Newb
 
Join Date: Jan 2006
Location: Central Michigan
Posts: 11
Another common problem for the TJ is a broken or stripped blend door. If the blower blows but does not switch to defrost look under the drivers side dash above and to the right of the skinny pedal. Have someone move the blend switch from vent to defrost and watch to see if all the vacuum pull offs are working properly and if the blend doors are actaully moving. HTH
__________________
97 Sport 4.0l Auto D30/D35 (3.07 - I know )
2" BB Skyjacker, 1" BL, 1" MML, 285/75/16 (33") Goodyear MTRs, 16x8 MT Classic Locks, Warn Front Bumper, Warn Rear w/ Tire Carrier, Jeeperman Front Hoop, Hella 500s, H4 Conversion, Cobra 75WXST.

Up Next: More Armor, Gears, Lockers, New Radiator (70k and leaking), ???.

3.07 Gears Club Member #1
Hunter9 is offline   Quote
Reply

Thread Tools

Posting Rules
You may not post new threads
You may not 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


Similar Threads
Thread Thread Starter Forum Replies Last Post
2001 Yellow Jeep Wrangler Sport (California) boudagh1 Classifieds Archive 7 03-31-2008 02:12 PM
Wrangler Sport = Death trap?? Swingwood TJ Tech Forum 38 09-14-2007 12:10 AM
JEEP Wrangler 1999 Sport 4x4 4.0L 4 Sale sadeacs Classifieds Archive 1 05-02-2007 10:37 PM
Built 00 wrangler sport. Yellow. Excellent condition. MR.CLIFFORD Classifieds Archive 6 01-15-2007 05:44 PM



Download our Mobile App

» Network Links
»Jeep Parts
» Featured Product

All times are GMT -5. The time now is 06:38 AM.



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