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Old 11-10-2012, 10:58 PM   #1
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Defrost not blowing

Ok I know i have some heater issues to begin with as the heat only gets warm not too hot but where is the ducting for the defroster? When I turn the fan speed over low it sounds like something is getting blown in front of the defrost vent and the air just stops flowing. This doesnt happen with the face vents or foot vents just defrost.

Any ideas?

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Old 11-11-2012, 03:37 PM   #2
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ok so i got the heat to blow hot today there was a cable bound up undert he dash for the temp contol. However it will still not blow out the windshield vent it blows out the side vents for the defrost but not the mostt important one.


suggestions welcome im at wits end after digging through the jeep today

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Old 11-11-2012, 04:58 PM   #3
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I have this same problemon my 97 TJ and I can't seem to fix it. I'll be following the thread to see if anyone figures this out
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Old 11-11-2012, 07:52 PM   #4
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Just bought my 99 TJ a week ago and this is my first post. Same problem as stated and hoping there is an answer. Worst part is this started the same day i did a Heater Core flush to get my heat back to working.
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Old 11-11-2012, 08:25 PM   #5
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I think we all have the same problem. I think I have a fix for us. They are known for having cheap vent doors. Check out
Heatertreatet.com I believe is the site.
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Old 11-11-2012, 08:33 PM   #6
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Heater Treater is for Jeeps with the electronic control and failure of the door circut to be able to distinguish cold from hot setting causing luke warm air.

My problem and these other gents it seems that have the cable slider is that the heat blows hot but wont blow out of the windshield vent only the side vents when set to defrost.

When i slide the selector over to defrost and the fan is on low it sounds like it is coming out the vent then if you turn the fan up it seems like something is blocking that vent from letting air pass like the central defrost door is stuck shut. Trying to see if anyone has a fix for it before i spend the 4-5 hours removing the dash to access the heater box.
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Old 11-12-2012, 11:10 AM   #7
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Bump hopefully someone with knowledge of this problem can chime in. I am sure this isnt the first time this problem has popped up.
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Old 11-12-2012, 11:33 AM   #8
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same issue. not sure yet but from what i have been told (family was previous owner) the door that routes the air to defrost is broken off its arm.
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Old 11-12-2012, 04:05 PM   #9
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Had problems with my 03 TJ when I bought it used from a dealer. It was reluctant to change from floor to dash to defrost. Technician notes say a vacuum hose had come loose that had be reattached. That vacuum line changes tha airflow to dash, floor, defrost. Maybe if you pull the glove box off and pop the defrost vent trim off you can locate the culprit.
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Old 11-12-2012, 05:18 PM   #10
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Quote:
Originally Posted by Mom sold the Jeepster View Post
Had problems with my 03 TJ when I bought it used from a dealer. It was reluctant to change from floor to dash to defrost. Technician notes say a vacuum hose had come loose that had be reattached. That vacuum line changes tha airflow to dash, floor, defrost. Maybe if you pull the glove box off and pop the defrost vent trim off you can locate the culprit.

From what I've read the 97-98's did not use vacuum, they were cable driven for the vent positions..
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Old 11-13-2012, 11:33 AM   #11
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havnt looked yet. anyone know where to get access on a 97
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Old 11-13-2012, 10:29 PM   #12
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access to what? I think my issues are cable drivin.......... pun intended
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Old 11-15-2012, 07:26 PM   #13
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I see I am not the only one with this problem. I have a 97 i bought a couple months ago and its getting cold and i need to get this fixed.I plan on taking the dash apart this weekend to see what I find.
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Old 11-16-2012, 12:23 AM   #14
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Let me know been too busy to get a chance to rip mine open. Only good thing is that the interior is going to get a paint job when i tear it out lol
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Old 11-16-2012, 12:46 AM   #15
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Just bought my 99 TJ a week ago and this is my first post.
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Old 11-16-2012, 05:09 AM   #16
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im tuned in. really dont want to pull my dash for nothing. if i ever get some time guess ill tear into it
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Old 11-16-2012, 07:03 AM   #17
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I was looking under my dash and saw something disconnected, like a little metal lever type thing going into a black box which moves when you change the vents. I'll show pics once I get out of school.
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Old 11-17-2012, 05:24 PM   #18
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Well I found the problem,fixing it is another story. The vent dampers are controlled by 3 dif actuators with cheap plastic pieces controlling damper movement. The one arm that controls air to the defrost is broke off the dmper and I can't even manually open it. The actuator still works but it's a piss poor design with the plastic arm that broke. To replace it the whole dash needs to be removed. to see the actuators and arms just have to remove the panel under the steering wheel which is only a couple of screws then look to the right to see if you guys are having the same problem
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Old 11-17-2012, 09:11 PM   #19
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think you could post a couple pics please?
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Old 11-18-2012, 02:24 PM   #20
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i woke up this morning with an idea. the dash doesnt need to be removed to fix my problem. the plastic arm broke leaving the male "gear" stuck inside the damper. i threaded a screw a few turns inside the part that broke and was able to pull it out. the arm is hollow so i screwed a small screw inside it and was able to put the whole thing back together. it seems pretty solid and it is working again. there is a lot of stress on it and it mat not last so i will look online for a replacement. i didnt take pics of the process because i wasnt sure if it would work. i didnt want to take it all apart to take pics. sorry. i have pics of the location of my problem and the broken arm. i am pointing at area will a small yellow screw driver. once you guys look inside the dash my idea should make more sense.
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Old 11-18-2012, 04:22 PM   #21
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MOPAR Blend Air Door

MOPAR Blend Air Door






Vehicle Fitment
1997-1998 Jeep Wrangler TJ
See Product Details Below

Part Number:4897626AA
Our Price:$34.99








MOPAR Blend Air Door 4897626AA

www.jeep4x4center.com/lever-blend-air-door-4897626aa.html


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Old 08-08-2013, 06:35 PM   #22
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Originally Posted by Philmycrackin View Post
MOPAR Blend Air Door

MOPAR Blend Air Door
The problem they are describing is not a blend door issue (the blend door adjusts the level of heat/cold, that's it!).

I've removed my heater dash/heater core twice in the last month, so I'm pretty fresh up on what does what.

Here is the color coding of vacuum lines going to the three different "vacuum door actuators" in my 1997 TJ SE, No A/C:
Blue & Yellow: Controls the door to the Defrost vents
Red: Controls the door to the cab/hand warmer vents
Brown: Controls the door to the Floor vent

My troubleshooting suggestions:

1) Check the vacuum line connector behind the glove box. Make sure the connector is secure and all the lines on both sides of the connectors are snug and there are no obvious cuts along the visible vacuum lines.

2) check the end of the vacuum lines where they terminate at the three separate vacuum door actuators (on the driver side end of the heater box).

3) If this all checks good, then pull each vacuum line separately at each location in #2 and check for vacuum when the respective doors are actuated, as I have identified by the color coding, above.

The above steps should troubleshoot 90% of the problems as described by TJ owners, above.

A couple of other notes regarding the heater and their levers, from hard earned experience with my 1997 TJ:

If you heater core is leaking, you don't need to take out the steering wheel/column as listed at STU OFFROAD for replacement; just support the removed dash suspended by a tie down from the large footmans loop above the rear view mirror (remove the mirror first)... it will save you 30-60 minutes of time, and prevent you from risking damaging your air-bag clock spring.

If you have a 97-11/99 TJ with the manual slider/cable for temperature control vs. the newer electronic knob and electronic actuator (either of which moves the AC Plenim Door via the Lower AC Panel Plenum Door Lever), than:

1) If you need to replace your lever (you snapped it off) DO NOT GET the Omix-Ada 17910.01 HVAC Door Lever; all online catalogs (Amazon, etc) says it will fit, but it will not... you will have to buy the more expensive Mopar Part # 4897626AA , which I have seen for $27-$35 each. I stopped buy a local Jeep Dealer's parts counter and they said that you couldn't just buy the lever anymore... you had to buy the blend door too... whatever... that part is currently available online out there at the time of this post.

2) Before you snap off you lever, lube the darn cable! (or if you are replacing the broken lever, do it too!). That slider/cable should move smoothly, without too much force... if it takes a lot of force to move that lever... STOP WHAT YOU ARE DOING! and lube the cable first (motorcycle store for a cable lube tool and a can of cable lube). If that doesn't solve the issue, then you might need to replace or re-align your blend door... don't snap off your lever (like I did) trying to force a misaligned blend door to work properly... it just cost me and extra $35 for a new lever (and i still had to take apart the heater box to re-align the blend door... and now replace the lever!

You can also trouble shoot a stiff lever, before you even lube that cable, by removing the cable from the lever... the lever should move freely and easily back and forth... don't try and force it if it doesn't.

3) If you plan on replacing your blend door, DO NOT get Dorman 902-326 part.: it is for the 99+ TJ's using the electronic actuator, not the cable/lever of the 97/98.

The M

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