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Old 04-10-2013, 01:41 PM   #91
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So after replacing the heater core and doing an upgrade on the blower motor, I noticed that I too have a problem with the vent door not opening. I pulled out the control panel and found that the vent cable (one?) was not attached to the stud on the slider. I attached it and found that the cable seems to be siezed, so the PO must've unhooked it. In the original post, the diagram shows two cables that actuate the vents, but I only see the one cable at the control panel. I also noticed that it seemed to go up and to the right from the control panel. Before I saw the diagram, I thought there was only the one vent on the passenger side, but I now think that this cable goes to the right side vent behind the speedo. Is there a connection between the cable to the right vent and the left vent that allows both to actuate at the same time, somewhere further into the dash? Or, is there supposed to be two vent control cables?

Even though I feel I know the answer, do you have to tear the dash apart to replace the vent cable?

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Old 04-28-2013, 09:50 AM   #92
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thanks for the awesome info!!!

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Old 06-16-2013, 04:10 PM   #93
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Where is the Vacuum Motor located?
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Old 11-10-2013, 05:12 PM   #94
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The left cowl gate?

So I have air leaking from under the dash on the drivers side and after reading through this post I have no doubt its the left cowl gate. It leaks no mater what the position of the heater. So where does the left cowl gate connect to the control lever? I'd love to fix this as it's to sole reason why my dash leaks snow in the winter and water when there is a torrential down pour.

Anyone else have this problem or a solution?
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Old 11-11-2013, 06:49 AM   #95
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That gate won't cause a water leak. The leak is most likely 1 of 3 things. Cowl seal, cowl drain, or body seam. For details on finding which one, visit the following link.

Troubleshooting water under the dash, write-up, how-to...... - JeepForum.com

As for the air coming in. The system never shuts off air completely. In the "Off" position that just means the fan is off. The only difference between "Off" and "Vent" is that vent will bypass the heater core and your windshield and feet vents. So, while driving down the road in "OFF" air will come out of your windshield vents. It can also come out of the floor vents if that gate isn't closing all the way as described in the first post. Of course it could be the cowl gate letting air in. But it shouldn't be letting water in. You can test it though, dump water in the cowl and if the drain is clear and draining and water still gets in. Then that's it.
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Old 11-11-2013, 09:21 AM   #96
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I'm sure it is the cowl gate. The windshield seals are new and the body seam is good. I've already pulled the tip off the drain tube in anticipation of possible clogging.

So if it is the gate not closing all the way does anyone have pictures of one Out side of a Jeep for reference? How does it adjust?
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Old 11-11-2013, 02:01 PM   #97
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Where does that vent come out in the jeep?
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Old 11-11-2013, 02:11 PM   #98
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It's up behind the drivers side above the steering column. There looks to be a vent up there but never knew where it went/came from so i'm thinking it is the cowl gate.
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Old 11-11-2013, 02:38 PM   #99
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is the blower motor hard to replace in a YJ?
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Old 11-17-2013, 06:24 PM   #100
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Excellent Diagram Heater Help

I just had a heating issue after 15 years on my 88 Wrangler. It blows cold air with all controls in appropriate location and verifyed position on heater box. I decided to do some maintenace that was needed anyway. All hoses changed radiator top and bottom. Heater core supply lines, while off checking for obstructions, running water through heater core. I changed thermostat and housing. No progress sitting in my 70* shop. My heater core incoming supply
line gets warm but I can hold it. I replaced Radiator cap. My baby runs at 195 to 200 at highway speeds and sitting still in my shop. I have a complete shop manual from the dealer. It shows on the heater control (#10) page L9 an air door motor switch. Could this be my culprit? What is concerning is my supply to heater core hose not being any hotter than it is. I have put another theromo in it after dropping it in a pan of boiling water and it opens. It's all fun but I am ready for help. Respectfully, Jack
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Old 12-15-2013, 12:51 PM   #101
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Quote:
Originally Posted by animal0307 View Post
It's up behind the drivers side above the steering column. There looks to be a vent up there but never knew where it went/came from so i'm thinking it is the cowl gate.
I have the same issue on my 89 the driverside cowl vent is stuck open it makes for a brisk drive on the hiway in single digit weather so cold the heater can not keep up which is usually like a blast furnace
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Old 12-17-2013, 12:33 AM   #102
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New problem, put the heater control into the vent position and now I cannot turn the blower motor off(unless in vent position). Also, I can't put the control to just "defrost" position. It's either Vent, Heat, or Heat with a slight flow of air through the defrost vents. Any help?
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Old 12-18-2013, 05:32 AM   #103
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It could be the cable binding that directs the air flow to the defrost or the floor. Or the stay could have broken that holds the cable housing in place.

To vary the defrost/floor mix, you move rod that the cable is attached to. It is located a little below and right of the stereo on the blower housing.
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Old 12-18-2013, 06:12 AM   #104
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the switch for the motor is probably bent. I had this problem too. Had to tweak the arm on the switch
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Old 12-20-2013, 09:25 AM   #105
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Quote:
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It could be the cable binding that directs the air flow to the defrost or the floor. Or the stay could have broken that holds the cable housing in place. To vary the defrost/floor mix, you move rod that the cable is attached to. It is located a little below and right of the stereo on the blower housing.
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the switch for the motor is probably bent. I had this problem too. Had to tweak the arm on the switch
Thanks guys, I'll pull it apart later today and check it out.
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Old 12-20-2013, 07:44 PM   #106
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I have a bit of cold air mixing in with the hot I figure it's the blend door not closing all the way is there a way I can get it to close without taking everything apart I've tried disconnecting the cable and moving the rod by hand but it still doesn't close all the way any suggestions??
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Old 12-31-2013, 03:24 PM   #107
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Where can I find this switch? all the auto parts stores say it's obsolete and can find it anywhere
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Old 01-04-2014, 04:49 PM   #108
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Heater box

weird heat flow problem?? 1995 YJ 4 cyl
my passenger side floor heat vent blows cold air! while the driver side floor vent blows warm air! According to the pic & as far as I can remember both drivers side & passenger side floor vents are both from the same outlet. Kind of boggles my mind how I can have one side blowing hot air the other side cold air when both sides come from the same outlet. makes no sense to me at all.
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Old 01-05-2014, 01:10 PM   #109
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I have 1995 wrangler manual with under dash ac. The temp adjust slider seems to be disconnected, as I can manually open door for heat with my finger but not with the slider. Is there any easy way for a novice mechanic as myself to get behind ac ductwork and reattach the cable? I make the assumption this is where I would look to fix this. A PM is ok if needed.
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Old 01-22-2014, 03:29 PM   #110
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Quote:
Originally Posted by jbbcd View Post
weird heat flow problem?? 1995 YJ 4 cyl
my passenger side floor heat vent blows cold air! while the driver side floor vent blows warm air! According to the pic & as far as I can remember both drivers side & passenger side floor vents are both from the same outlet. Kind of boggles my mind how I can have one side blowing hot air the other side cold air when both sides come from the same outlet. makes no sense to me at all.
Check the flapper on the pass. side. You might have to manually close it so the heat isn't getting bypassed. It's a common issue, usually the passenger complains of having cold feet while heat is on. When you slide to "vent" it opens the flapper to the outside air, when you slide to heat it should close but does not.
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Old 01-23-2014, 05:08 PM   #111
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Quote:
Originally Posted by jbbcd View Post
weird heat flow problem?? 1995 YJ 4 cyl
my passenger side floor heat vent blows cold air! while the driver side floor vent blows warm air! According to the pic & as far as I can remember both drivers side & passenger side floor vents are both from the same outlet. Kind of boggles my mind how I can have one side blowing hot air the other side cold air when both sides come from the same outlet. makes no sense to me at all.
I have a 95 yj and it does the same thing. But it's not really cold but its 25 degrees cooler and while on defrost the driver side vent blows a lot cooler than the passenger side. I've been working on fixing the problem but no luck yet. With a flash point laser temp gauge it shows the defrost on the driver side at 110 and the passenger side at 135 degrees it's crazy
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Old 01-23-2014, 06:10 PM   #112
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when I hav the blower "switch" on low I can't hear the blower running and a minimal amount of heat comes out. It seems to be high or nothing. Any ideas anyone?
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Old 02-08-2014, 04:08 PM   #113
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heater

As a new YJ owner.... thanks for sharing the heater information
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Old 02-08-2014, 10:15 PM   #114
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How would you go about changing the blower motor the vent seems to have some kind of epoxy around it and I tried prying it with a chisel and it put a small hole in the plastic vent under the dash should I try a heat gun to loosen the glue? After I get that off what else am I looking at? I looked under the battery tray and couldn't find the plug for the motor so what does that mean? Sorry for all of the questions but thanks!
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Old 04-11-2014, 10:31 AM   #115
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hello ,
I have a 1990 yj wrangler heater issue - the temp control stopped sliding properly i have to reach down at blend contact and release bar out of slot to allow it to go to full heat temp and vent doesn't open when slider is in vent position have to open by hand.
can any one tell me if this is a cable issue ( i realize it all works with cables) so i guess i'm asking do i need to replace the two cables ?
kind regards,
mdgilbreath
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Old 06-05-2014, 12:14 AM   #116
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I've noticed my left side Cowl gate and the end are missing. Is there anywhere to get a replacement end cap and cowl gate ?
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Old 06-06-2014, 01:46 AM   #117
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'mdgilbreath'/ 'kentuckymike'...sorry its a little late but...my 91yj had a similar problem, the cables were NOT broken although the slider control unit in the dash WAS. it was broken at the cable attachment piece that 'clamps; around the cable 'housing', therefore the slider lever would seem to be working but the cable would not operate correctly. I too had to reach down to get the heated air going in the desired direction. The whole control unit would have to be replaced. I being cheap, was able to 'rig' it with epoxy and some custom cable shortening, you must remove the whole control unit...BIG PAIN...Also I BLOCKED the Cowl INLET outside with a plate of 'Plexi' and just cut a BIG Hole in the INLET TUBE under the dash [ and put some screen over the hole to keep bugs and trash from getting in there and clogging the 'Core']...The 'VENT Cable' is disconneted on Mine now so the heater always has air supply...but putting the slider control to the 'VENT' position turns the Blower motor off ! If I Need VENT AIR...I Leave the windows down !! or the doors off!
It a JEEP Right?
The control unit is no longer available I was told by 'JEEP Co.' {kentuckymike}..junk yard Item for that stuff Now!.....I like the new set-up...it gets below zero here in so. dakota, a 10" rubber Cover goes over the center of my radiator [zip ties !] when it gets under 40 degrees [mid November] and a plate goes over the grill to keep the air-blast off the radiator! I HAVE GOOD HEAT at zero temps !! [the blower upgrade was worth the trouble !!!]

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