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Unread 04-29-2011, 11:03 AM   #91
Que89YJ
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1989 YJ Wrangler 
 
Join Date: Apr 2008
Location: Detroit, Michigan
Posts: 17,282
You dont have to get a new cable. They are difficult to come by. I put 2 little cuts on each side using a dremel where it is clippedthem to the controller and wraped a tie wrap around it. I will have to put up pics when I can. It is real easy to do.

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Unread 04-29-2011, 11:06 AM   #92
giggityjeeper
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1990 YJ Wrangler 
 
Join Date: May 2007
Location: British Columbia
Posts: 4,022
Quote:
Originally Posted by Que89YJ View Post
You dont have to get a new cable. They are difficult to come by. I put 2 little cuts on each side using a dremel where it is clippedthem to the controller and wraped a tie wrap around it. I will have to put up pics when I can. It is real easy to do.
so its still broke tho....

so if ya break it to make it not broke a new cable would be needed....

wreckers would have them, every YJ I saw still had the cables, fishingthem out might be a *****, but thinking of going and trying jsut for spares... I jsut spuer glued the botom of it on as long as its in there it cant really get out even broke...
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1990 YJ. SOA, OME 36R 3.5" lift springs, OME 5/8 greasable shackles, OTT high steer, Custom cage, team Rush, Posi, 33 TSL swampers
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Unread 05-04-2011, 05:36 PM   #93
Jims-87YJ
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1987 YJ Wrangler 
 
Join Date: May 2010
Location: Lansdale, Pa 19446, PA
Posts: 697
OK since this thread got revived I have one question to ask that has not been covered.
This is the picture of the Vacuum motor that controls the air flow from outside:



Is this in the Open or closed position?

Does anyone have a picture of (or know) which way is actually open or closed? (What does the flapper door look like?)

I always feel cold (outside air) coming into the Jeep even when everything is "off", I did have the heater assembly apart a while ago and I may have the vacuum lines switched. But it would be nice to be able to see the inside of this part of the vent. Thanks, Jim
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1987 YJ, 258, Weber 32/36, HEI, Custom Sound bar, Hardtop/Sun-rider/bikini tops, 2" Lift, 1/2" Boomerangs, 1" Body & MM Lift. 32x11.5x15 Copper STT's on Black Rock 950 Lobos w/4" backspacing, Still need Front Bumper and Seats.

My build thread: [url]http://www.jeepforum.com/forum/f12/my-very-slow-87-yj-build-thread-1137667/[/url]
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Unread 02-03-2012, 07:01 AM   #94
Fireguy211
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1994 YJ Wrangler 
 
Join Date: Jun 2011
Location: Rockton, IL
Posts: 36
Quote:
Originally Posted by Jims-87YJ
OK since this thread got revived I have one question to ask that has not been covered.
This is the picture of the Vacuum motor that controls the air flow from outside:



Is this in the Open or closed position?

Does anyone have a picture of (or know) which way is actually open or closed? (What does the flapper door look like?)

I always feel cold (outside air) coming into the Jeep even when everything is "off", I did have the heater assembly apart a while ago and I may have the vacuum lines switched. But it would be nice to be able to see the inside of this part of the vent. Thanks, Jim
The flapper you are talking about seeing is under the cowl vent which is located just behind the hood hinges. Mine Is Crome. Take the screws out and remove the screen, that vac motor you are looking at controls the flap on the passenger Side.
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Unread 02-03-2012, 12:15 PM   #95
SpikesHD
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1987 YJ Wrangler 
 
Join Date: May 2011
Location: Rogers, Ar.
Posts: 221
Awesome thread.

My blower has always sounded fine, but the Jeep NEVER warms up. After checking the things in this thread, I found out someone had knocked the black vacuum line under the dash loose and plugged it back into the last hole that should be empty. After switching them around I'm getting lotsa lotsa heat!!!

Thanks!
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Unread 02-06-2015, 12:10 AM   #96
bergovoy
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1990 YJ Wrangler 
 
Join Date: Nov 2014
Location: San Gabriel, California
Posts: 397
to revive this excellent thread, i will add/clarify a thing or two...

the passengers side flapper, the one that is controlled by vacuum, is NORMALLY OPEN...this means that when the jeep is off, the flapper / door is open and fresh air goes into the jeep... (like we need fresh air)...

when the control is switched off, and the motor is running, vacuum is present, the door is closed...meaning the plunger on that vacuum switch with the green and black wire, is now allowing a vacuum tobe passed to the vacuum motor that controls the flapper door, so it will now 'close'.

when you slide the switch to def/heat you are allowing the plunger to spring back to normal position, and then close the vacuum and the flapper now opens allowing fresh air to blow by the heater core... and with the fan blow thru the vent...

if you reverse the plug on the plastic 'plunger' type switch, you are in effect reversing the operation of the vacuum controlled door... and it will operate in reverse...

sometimes it might help and sometimes it wont, depending on what function,

keep in mind that newer a/c controls usually include some type of 'fresh' or 'recirc' air flow...

the jeep is the same... when the flapper door is open that is fresh air, and when it is closed it is recirculated air...




also, the passenger side interior vent door is cable controlled...but there is an 'adjustment' process.. when installing new cables etc or replacing parts or components .... try to adjust the door, manually, so that it will 'just open' to the point where it starts to spring forward... (towards the front of the jeep)... basically, if you were to go from full closed to full open, you would feel some 'resistance' then it will want to spring on it's own... just before that point, is the 'sweet spot'... if you go too far, the cable wont be able to bring it back to closed...

be happy with full closed to '3/4' open...

i had to 'replace' my control unit because i was told by a mechanic that there was a broken plastic part...

after I bought a replacement, (used) from eBay, I pulled the old one out and saw that it is the nylon washer/stud thing that clips the end of the cable to the slide mechanism... you can see them on the above pictures..

I ended up breaking the new one that I bought in the same place... because the white cable was out of adjustment... there is a screw adjustment that lengthens and shortens the 'housing' of the cable, and basically makes the inside wire cable longer or shorter, or rather it allows the slide mechanism 'def/heater/vent' control slider to move from full off to vent...

if the cable is out of adjustment, you wont be able to slide the def/heat/vent control all the way, and or break that nylon 'stud' piece.

I ended up drilling out the center of the nylon stud and inserting a #6x1" machine screw. it threaded onto the nylon and I put some heat shrink tube onto the end to create a better fit for the cable end
vent-control-modification-top.jpg   vent-control-modification-bottom.jpg  
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