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Topic Review (Newest First)
09-25-2013 12:47 PM
frog1markham
I'm so glad I found this thread!!

I was having the same issue as some of you posted. I just picked my Jeep up from the mechanic and he had just replaced the intake manifold gasket trying to fix a exhaust leak.... then my air started acting up. After reading this thread I went out and sure enough the vac line was tucked up behind the cords on the hood.... Thanks for leading me in the right direction!!
02-05-2013 08:32 PM
lys327 sweet i will check the lines again, after the temp gets above 20....
02-05-2013 07:33 PM
gixxerphil
Quote:
Originally Posted by lys327 View Post
i have a 97 tj (no ac in jeep), my issue is when i put the heat on floor, it blows little out the floor and most through the defrost. when i put it on driver only the left two vents blow out. temp is good, just bad flow. i have read through this thread and dont see anyone else having this prob. any advice?

You have a disconnected/hole in your vac line.

Let m find the digram

http://www.wranglerforum.com/f5/fan-...nts-81054.html
02-05-2013 07:31 PM
lys327 i have a 97 tj (no ac in jeep), my issue is when i put the heat on floor, it blows little out the floor and most through the defrost. when i put it on driver only the left two vents blow out. temp is good, just bad flow. i have read through this thread and dont see anyone else having this prob. any advice?
01-28-2013 08:20 PM
michaelD thanks for this thread. I have an '03 and just replaced PVC fittings when heater selection went out. Was set to get under dash when I decided to check forum! Figured the vacuum line had to be right where I had been working, and sure enough, found it. Took a bit longer to find where it went, and the fit was pretty sloppy, but I found some perfect size tubing to act as a shim/spacer, and everything works. 5 min fix! Thanks again
10-30-2012 07:40 PM
tai_66
Quote:
I also have the problem with the defrost not working. Except:

Mine starts to work. Then I hear a thumb like something is getting sucked/blown into the airway. When I return the switch to the vent or floor I hear it release from its spot. Before I start digging around under the steering wheel, has anyone had this problem. The sound comes from slightly below the defrost vent.
Yes, I had the same problem. It sounded to me like when the fan started going above the lowest speed it would slam the door closed, because the defrost worked when idling with the fan speed at its lowest, but if I reved the engine and the fan went faster, or I just turned up the fan speed, it slammed it closed (at least thats my theory).

I checked the actuators, and my defrost one appeared to be either broken down inside where I couldn't see, or loose. I was going to try putting a screw through it as suggested, but I just pushed on it, and it seemed to "seat." Been running the defrost and all other modes for about a week, and everything works.

HOWEVER, now it sounds like the fan in hitting something. I am assuming it is hitting the door but not knocking it closed now? Anyone have any theories on that?
10-30-2012 07:13 PM
Xikky same problem except that it only blows through the feet vents and the top of the face vents to defog the windows..
10-21-2011 04:40 PM
jebby same problem hoping to tear into it this weekend. any tips on getting at it to put the screw in?
10-20-2011 03:40 PM
rwatters
Similar Problem

I also have the problem with the defrost not working. Except:

Mine starts to work. Then I hear a thumb like something is getting sucked/blown into the airway. When I return the switch to the vent or floor I hear it release from its spot. Before I start digging around under the steering wheel, has anyone had this problem. The sound comes from slightly below the defrost vent.
10-10-2011 07:19 PM
IIsick Ok not a Newb to Mechanican but a Newb to working on Wranglers, finally decided to tear into my 98' to fix the defroster, found the broken lever for the defroster door, tried extracting the broken piece and it wouldn't budge so I ground a screw down to about a 1/2" long and then put nail glue on one side and screwed it down, seems to be working so far. Thanx for posting the fix and the pics I would have spent hours looking for the problem as I originally figured it was a vacuum problem.

Again Big Thanx for posting the fix and pics.
10-01-2011 07:47 PM
Devon My 2002 Sport had the same issue, heater would blow through the defroster and floor vents only. After reading this thread I was able to get my husband to pull out the battery and tray and find the vacuum hose was split part way. He kept asking are you sure cause i don't see any hoses...I assured him it was there and was very relieved when we found the split hose! Glad it wasn't the blend door because i would have been the one tearing apart the dash.
10-01-2011 03:21 PM
Itsnice2be
Quote:
Originally Posted by javi1r View Post
I have a similar problem with a 2002 jeep Wrangler every thing works except that the AC or heat only blows to the defrost position. I tried to get inside to see what is going on but I was not able to open it completely. I could touch the nob selector in the back and from it there is a power cable and another cable (6 color small pipes, not actual wires) which goes to the dash, the floor and the defrost actuators. Not sure how the nob switch works as it is not mechanical, maybe they work with air preasure. The 6 small pipes split behind the globe box and I can disconnect this bundle and the air still goes only to defrost position. If I disconnect the power for the switch still all the air goes to the defrost position. By reading the forums some people is saying that it could be a problem with the VAC or the blend doors. On the 2002 I think the problem is the switch itself but not sure so any help is greatly appreaciated.
My mode switch had the plastic cracked in the back which was causing the problem mentioned.
06-21-2011 05:27 PM
wirejock
Damper control

Quote:
Originally Posted by Rogue View Post
I have an '02 Wrangler and had the same problem. I crawled up under the dash to look for broken door hinges and found nothing. I zip tied vacuum lines to manifolds and nothing. I found a cracked vacuum hose in the fender on the passenger side under the battery. FIXED! So nice to have heat that blows through the vents all the time!

Check here: http://www.wranglerforum.com/f5/heat...ors-37712.html
Funny. I have an "02 Wrangler Sahara. Exact same problem. The vacuum line to the canister under the battery tray was broken. I had to remount the canister. It must have come loose at some point cuz it was wedged in the wrong position and broke the hose.
06-21-2011 05:10 PM
katycamp BillD, I know this is an old post but I am now having the exact same problem that you posted here. The black plastic arm is broken just like you show in your picture. My question is do you think it would work if I just used a really good plastic epoxy and glued it back in??
04-04-2011 08:09 PM
kalreid Great post, thanks for sharing
04-08-2010 09:51 AM
autopc25
Quote:
Originally Posted by firemanfrmny View Post
I have a 97 TJ and have the full service manual for it in PDF format, if anyone needs it
Got the email for the manual.

Thanks a million!!!
04-08-2010 09:50 AM
autopc25
Quote:
Originally Posted by richp View Post
I just fixed mine on friday or saturday, removed the drivers side kick knee panel, looked to see which blend door arm was broken, snapped out the vac motor for the broken blend door, took off the broken arm attached to the vacum motor, took it inside, big hole to little hole in the broken arm, must be part of the forming process, dropped a big enough self tapping screw down [phillips head brass which is all I had for the size and length] then screwed it thru the broken part. That left about an inch sticking out of the end of the arm. Now the hard part, you need to see where the fully retracted and fully extended postions of the vac motor are, once you figure that out you just stick the broken arm back in the hole with the screw sticking out, start screwing it in, the door shaft already has a hole in it the same size as the broken lever part then screw it in till it's tight, don't strip it or you will need a bigger screw. Unsnap the vac motor and put it back on the end of the lever, snap the motor back in and thats it.
The vac motors are on bayonet fittings they pull straight away and push back in. If I have to do it again I'll stop by a hobby shop and pick up some cycoanlite [sp?] plastic super glue made specifically for plastics and use that one the threads exercising extreme caution not to get it on the sides of the lever or you will make that lever a permanent part of the heater box.
How long did it take you to do the fix and is it still working?
02-02-2010 03:30 PM
up2nogood PM sent, thanks.
02-02-2010 07:02 AM
autopc25
Quote:
Originally Posted by jamesdeanblvd View Post
Great job with the pics. I did the same thing to my defrost about a month or so ago. Sheet metal screw worked great. When I hit the defrost now, the door slams open. As soon as I did it and it worked, I thought "I wish I would have taken better pics". I think this little tip can save a lot of people some headaches.
Where did you find the pics?

Thanks
02-01-2010 08:35 PM
up2nogood Having sort of the same problem, I don't understand how to get to the blend door, i've looked all over and all I see is a big vacuum can opening a big flapper door and a lever that moves with the temp slide adjuster. Both are located on the passenger side, under the dash. I looked under the steering column, behind the cover, but didn't see anything. I followed the vacuum line from the intake manifold back to the "T", then traced it both ways. It seems to be plugged in tight, but I may replace it all to be sure. I'm getting very frustrated with my TJ, its the first Jeep i've had since high school. It has to be vacuum related, because I can't seem to direct the heat where I want it. I was surfing ebay for other parts and came accross something called a "heater treater". The pics and description made the fix look simple, but what is under my dash doesn't look like the pictures.
02-01-2010 07:55 PM
jamesdeanblvd Great job with the pics. I did the same thing to my defrost about a month or so ago. Sheet metal screw worked great. When I hit the defrost now, the door slams open. As soon as I did it and it worked, I thought "I wish I would have taken better pics". I think this little tip can save a lot of people some headaches.
02-01-2010 05:29 PM
autopc25 Anyway to get the pictures back up?
02-01-2010 04:42 PM
Rogue I have an '02 Wrangler and had the same problem. I crawled up under the dash to look for broken door hinges and found nothing. I zip tied vacuum lines to manifolds and nothing. I found a cracked vacuum hose in the fender on the passenger side under the battery. FIXED! So nice to have heat that blows through the vents all the time!

Check here: http://www.wranglerforum.com/f5/heat...ors-37712.html
02-01-2010 03:22 PM
Peabody I thought the A/C vacuum selector switch was bad because all selections resulted in air only from the defrost & floorboard. Plus the knob turned funny like the switch was just broken. All vacuum lines appeared to be in good shape and connected. I bought a replacement switch online ($25 with shipping). Went to replace it this weekend and after pulling the dash and controls, realized nothing was wrong with the switch, the knob was cracked where it engaged over the switch and was slipping when turned. I turned the switch with pliers and everything worked fine. Replacement knob ordered for $12. I'll keep the replacement switch in case the old one DOES go out (like I really would be able to find the replacement by then)
01-21-2010 01:19 AM
JeffsJeep
missing pictures

I don't suppose we could get a repost of the pictures to go along with the original post?

01-05-2010 05:58 PM
JeepsFTW I had this problem and me and my dad just replaced some hose and it worked perfect again, not sure which hose it was though.
01-05-2010 04:36 PM
fjones I'm new to this forum but you people are great. Very knowledgable. All my heat and AC went to my defroster vents and all I could imagine was crawling under the dash to find the problem. This post said to check under the hood and I found the vacuum line just hanging around and doing nothing. Found where to plug it in and Wa La the problem was fixed. The rubber boot was loose on the fitting so a small ziptie tightened it up nicely. Thank you all for the info. It took ten minutes to fix. can't get any better than that.
Thank You again
01-10-2009 09:30 PM
genemarsh
Quote:
Originally Posted by superbad007 View Post
I also have a 97 and am having the same problem. Except the problem with mine is that the air is not coming out of the windshield defrost vent. I haven't tore apart the dash yet to examine it but it sounds like we have the same problem.
I have the same problem with no air going to the defrost vents. I did find the actuator arm broken that controls that part of the system. I removed the broken arm and paid a dealer to order me a new one, but after several months, he finally said he couldn't get the part! Does anyone have the answer on ordering a replace actuator arm for the defrost. Seems it should be simple. *(This is for my 1997 Wrangler 4 cylinder) Thanks!
01-10-2009 11:20 AM
Taznc I also have a similar problem, much like the one above. No matter which position is set, except Off, the air blows through the Defrost. I have looked around a little but I am not really sure what to look for. Does anyone have any pointers or can lead me in the right direction? I am no mechanic but I would much rather do it myself than pay someone a lot of money to do it for me.

Thanks!
01-09-2009 06:59 PM
slf41002 Ok so if what I call the deflector flap(deflects the air from floor,vents,and defrost)is really a blend door and what I call a blend door that opens and closes to change from hot and cold air Or can be opened half way to blend for warm air (located on the passenger side) Is called what????
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