NAXJA Forums -::- North American XJ Association  

Go Back   NAXJA Forums -::- North American XJ Association > NAXJA Unibody Jeep Technical Forums > Jeep Cherokee XJ (1984 - 2001) > OEM Tech Discussion
HOME Member FAQ Sponsor Info Rules Bylaws E-Mail

OEM Tech Discussion Forum for OEM (Original Equipment) or stock XJs and MJs.

Reply
 
Thread Tools Display Modes
  #1  
Old March 10th, 2012, 15:29
sheffeyva's Avatar
sheffeyva sheffeyva is offline
NAXJA Forum User
 
Join Date: Sep 2009
Location: Portland, OR
Posts: 147
Question on HVAC controls!

While blindly removing all unnecessary wires and hoses I might have gotten rid of my HVAC vacuum controls!

Is this the two vacuum lines that need to be connected? I only have heat blowing out my defrost by the windshield and I'm assuming these are them. Just wanted to make sure.
Reply With Quote
  #2  
Old March 10th, 2012, 15:42
Shorty Shorty is offline
NAXJA Forum User
 
Join Date: Feb 2007
Location: on the beach in Ocean View, VA
Posts: 4,946
Re: Question on HVAC controls!

sure looks like 'em to me!

P.S. small block chevrolet in that one?
Reply With Quote
  #3  
Old March 10th, 2012, 15:50
sheffeyva's Avatar
sheffeyva sheffeyva is offline
NAXJA Forum User
 
Join Date: Sep 2009
Location: Portland, OR
Posts: 147
Re: Question on HVAC controls!

Quote:
Originally Posted by Shorty View Post
sure looks like 'em to me!

P.S. small block chevrolet in that one?
Certainly is a "small" block! Just a 2.8l V6 ! I put on an edelbrock manifold and holley carb and literally ripped off everything else! Luckily this all works on the 3.4l if I go that route but maybe a SBC in the future. It only has 80k on the motor so I figured I'll run it till it dies then upgrade. I more using this Jeep as a learning project for the suspension since I am coming from the world of Sport Compact cars!
Reply With Quote
  #4  
Old March 10th, 2012, 15:52
Shorty Shorty is offline
NAXJA Forum User
 
Join Date: Feb 2007
Location: on the beach in Ocean View, VA
Posts: 4,946
Re: Question on HVAC controls!

I saw that after I posted-- only 3 plug wires coming off the cap!! You beat me to the response before I could edit my question
Reply With Quote
  #5  
Old March 10th, 2012, 16:11
sheffeyva's Avatar
sheffeyva sheffeyva is offline
NAXJA Forum User
 
Join Date: Sep 2009
Location: Portland, OR
Posts: 147
Re: Question on HVAC controls!

Reply With Quote
  #6  
Old March 10th, 2012, 16:15
sheffeyva's Avatar
sheffeyva sheffeyva is offline
NAXJA Forum User
 
Join Date: Sep 2009
Location: Portland, OR
Posts: 147
Re: Question on HVAC controls!

Another question is how would I go about connecting these plastic lines to a single vacuum source? For the life of me I can't find fittings to change these for hard to soft lines so I can run them to the intake manifold.
Reply With Quote
  #7  
Old March 10th, 2012, 16:19
Shorty Shorty is offline
NAXJA Forum User
 
Join Date: Feb 2007
Location: on the beach in Ocean View, VA
Posts: 4,946
Re: Question on HVAC controls!

the first XJ I ever played with had the same set up! I got it running for someone else and thought I'd seen the last of Cherokees for ever......

A couple years later I had one fall into my lap for a song and the guy I helped with the '86 gave me the lift off it as a "thank you" for helping him get it running (two years after helping)

I'm still running the lift today-- shoulda kept the '86 for spare parts, but still woulda scrapped the 2.8L
Reply With Quote
  #8  
Old March 10th, 2012, 16:23
Shorty Shorty is offline
NAXJA Forum User
 
Join Date: Feb 2007
Location: on the beach in Ocean View, VA
Posts: 4,946
Re: Question on HVAC controls!

Quote:
Originally Posted by sheffeyva View Post
Another question is how would I go about connecting these plastic lines to a single vacuum source? For the life of me I can't find fittings to change these for hard to soft lines so I can run them to the intake manifold.
find some soft line that'll fit snugly over the hard line and a "Y" fitting for the vacuum hose. Run each hose to the "Y" and then into a constant vacuum source. The factory vacuum source was run into a vacuum storage canister (softball like reservoir behind the front bumper) to aid in HVAC operation during times of low engine vacuum.
Reply With Quote
  #9  
Old March 10th, 2012, 16:25
sheffeyva's Avatar
sheffeyva sheffeyva is offline
NAXJA Forum User
 
Join Date: Sep 2009
Location: Portland, OR
Posts: 147
Re: Question on HVAC controls!

Definitely not rebuilding this sucker when it dies but it has good compression and gets around just fine here in the hills of Portland on 32's and stock 4.10 gears. Probably going to start building a SBC of some kind here soon that way i can just swap when it does die!
Reply With Quote
  #10  
Old March 10th, 2012, 16:27
sheffeyva's Avatar
sheffeyva sheffeyva is offline
NAXJA Forum User
 
Join Date: Sep 2009
Location: Portland, OR
Posts: 147
Re: Question on HVAC controls!

Quote:
Originally Posted by Shorty View Post
find some soft line that'll fit snugly over the hard line and a "Y" fitting for the vacuum hose. Run each hose to the "Y" and then into a constant vacuum source. The factory vacuum source was run into a vacuum storage canister (softball like reservoir behind the front bumper) to aid in HVAC operation during times of low engine vacuum.
Would it be fine running to full manifold vacuum or should I fab up a vacuum ball like the factory. I'm getting about 22hg of vacuum at idle.
Reply With Quote
  #11  
Old March 10th, 2012, 16:32
Shorty Shorty is offline
NAXJA Forum User
 
Join Date: Feb 2007
Location: on the beach in Ocean View, VA
Posts: 4,946
Re: Question on HVAC controls!

you'd be fine at idle and under cruise conditions (low throttle), but as you've learned, the default position of the air door is defrost. Any time you're "on the throttle" or climbing a hill, you'll lose enough vacuum for it to default to the windshield.

I'd find a small vacuum ball at the boneyard and put it in line.
Reply With Quote
  #12  
Old March 10th, 2012, 16:37
sheffeyva's Avatar
sheffeyva sheffeyva is offline
NAXJA Forum User
 
Join Date: Sep 2009
Location: Portland, OR
Posts: 147
Re: Question on HVAC controls!

Thanks for all your help! And by the way I used to live in the same area you do. I lived right off of Princess Anne blvd in Virginia Beach. Really miss that area. I graduated high school over in Newport News awhile back also. I've been back there twice to live so far. I love the 7 cities area!
Reply With Quote
  #13  
Old March 10th, 2012, 16:41
Shorty Shorty is offline
NAXJA Forum User
 
Join Date: Feb 2007
Location: on the beach in Ocean View, VA
Posts: 4,946
Re: Question on HVAC controls!

Quote:
Originally Posted by sheffeyva View Post
Thanks for all your help!no problems at all-- glad I could help. I love the 7 cities area!I think you need a check-up from the neck up
Reply With Quote
  #14  
Old March 10th, 2012, 16:47
sheffeyva's Avatar
sheffeyva sheffeyva is offline
NAXJA Forum User
 
Join Date: Sep 2009
Location: Portland, OR
Posts: 147
Re: Question on HVAC controls!

LOL! To each their own! I hate the Pacific Northwest but some people think this is the greatest place ever !
Reply With Quote
  #15  
Old March 10th, 2012, 18:23
djgrayxj djgrayxj is offline
NAXJA Forum User
 
Join Date: Nov 2008
Location: West Covina
Posts: 496
Re: Question on HVAC controls!

Note from DJ
Take a look at this possibility for the location
1998 a/c vacuum canister
http://www.naxja.org/forum/showthread.php?t=1039575
Link to Picture by carves in post # 13 or hear it is
http://www.jeepforum.com/gallery/sho...limi t=recent
The square vacuum reservoir off a TJ is easy to fit in a cramped engine bay.
I just have mine on the front cross member.


The vacuum reservoir is the Black object to the left of the yellow arrow.
Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Only defrost setting works on hvac controls? Raymont OEM Tech Discussion 4 February 25th, 2010 22:09
HVAC Controls originalxj OEM Tech Discussion 5 October 19th, 2008 19:58
HVAC controls - clarification? mattbred OEM Tech Discussion 3 February 3rd, 2008 01:52
Light Bulbs for HVAC controls BAs96XJ OEM Tech Discussion 5 August 11th, 2005 14:36
HVAC controls imma honky Modified Tech Discussion 1 February 8th, 2005 13:55


All times are GMT -7. The time now is 00:54.


Powered by vBulletin® Version 3.8.9
Copyright ©2000 - 2018, vBulletin Solutions, Inc.
NAXJA and NAXJA logo's Copyright NAXJA. All content/images Copyright NAXJA 1999-2014