XJ HVAC system in YJ.....Lets try it.. - Page 2 - JeepForum.com

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post #16 of 134 Old 12-06-2011, 05:17 AM Thread Starter
youngjeeper11
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more pictures, these are just more detail close ups of the XJ system so you can get an idea of how it works

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Jeep 1:Used to have a 93 YJ 2.5l- 3.5" Black Diamond, Chevy TBI 5.7l V8, SM 465 4 speed, 8.8 rear( 4.10, L/S), rhinoline, Mile Marker 9000, NP 231, Had to sell it due to college
Jeep 2: 89/91 YJ, 4BT Cummins, NV4500, NP 231, Old Man Emu 2.5" suspension lift, 1" body lift.....Runs and drives, but very much a project
Interned at Novak Conversions 2 summers ago

Ask me about my 4BT Cummins Motor Mounts!!
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post #17 of 134 Old 12-06-2011, 05:23 AM Thread Starter
youngjeeper11
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a few more
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WP_000315.jpg   WP_000316.jpg   WP_000318.jpg   WP_000320.jpg   WP_000321.jpg  


Jeep 1:Used to have a 93 YJ 2.5l- 3.5" Black Diamond, Chevy TBI 5.7l V8, SM 465 4 speed, 8.8 rear( 4.10, L/S), rhinoline, Mile Marker 9000, NP 231, Had to sell it due to college
Jeep 2: 89/91 YJ, 4BT Cummins, NV4500, NP 231, Old Man Emu 2.5" suspension lift, 1" body lift.....Runs and drives, but very much a project
Interned at Novak Conversions 2 summers ago

Ask me about my 4BT Cummins Motor Mounts!!
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post #18 of 134 Old 12-06-2011, 05:26 AM Thread Starter
youngjeeper11
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and the last few
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WP_000322.jpg   WP_000323.jpg   WP_000324.jpg  

Jeep 1:Used to have a 93 YJ 2.5l- 3.5" Black Diamond, Chevy TBI 5.7l V8, SM 465 4 speed, 8.8 rear( 4.10, L/S), rhinoline, Mile Marker 9000, NP 231, Had to sell it due to college
Jeep 2: 89/91 YJ, 4BT Cummins, NV4500, NP 231, Old Man Emu 2.5" suspension lift, 1" body lift.....Runs and drives, but very much a project
Interned at Novak Conversions 2 summers ago

Ask me about my 4BT Cummins Motor Mounts!!
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post #19 of 134 Old 12-06-2011, 05:31 AM Thread Starter
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If you examine these pictures closely, you can see that I basically have 1 small bundle of wires to hook up, that I hastily cut in the junk yard, I think I may go back this weekend and try to pull the rest of this harness completly from another cherokee, 2 vacuum lines, that just need to go to my vacuum pump, and 2 wires to provide power to the motor, then after that it is plug and play.

Mounting will not be too bad once I measure off all the holes, and though it does not look like it in the picture, this thing is going to fit right in there.....I hope haha

Then I need to figure out my AC compressor and lines, but that will be a different project for sure....

Jeep 1:Used to have a 93 YJ 2.5l- 3.5" Black Diamond, Chevy TBI 5.7l V8, SM 465 4 speed, 8.8 rear( 4.10, L/S), rhinoline, Mile Marker 9000, NP 231, Had to sell it due to college
Jeep 2: 89/91 YJ, 4BT Cummins, NV4500, NP 231, Old Man Emu 2.5" suspension lift, 1" body lift.....Runs and drives, but very much a project
Interned at Novak Conversions 2 summers ago

Ask me about my 4BT Cummins Motor Mounts!!
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post #20 of 134 Old 12-06-2011, 05:36 AM
Dre40
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looks like it wont be to bad.. how much further does the Cherokee box stick out then the YJ one?
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post #21 of 134 Old 12-06-2011, 06:34 AM
twiisted71
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What year Cherokee did you pull that from?
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post #22 of 134 Old 12-06-2011, 06:51 AM Thread Starter
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Quote:
Originally Posted by Dre40 View Post
looks like it wont be to bad.. how much further does the Cherokee box stick out then the YJ one?
Not much further, maybe an inch, except over the tunnel it sticks out like 6 more inches.

Not positive what year, but I am pretty sure it was a 1990, but the system seemed to be pretty much the same in every cherokee I saw, and there is always at least 20 cherokees at every junkyard I have been to.

Jeep 1:Used to have a 93 YJ 2.5l- 3.5" Black Diamond, Chevy TBI 5.7l V8, SM 465 4 speed, 8.8 rear( 4.10, L/S), rhinoline, Mile Marker 9000, NP 231, Had to sell it due to college
Jeep 2: 89/91 YJ, 4BT Cummins, NV4500, NP 231, Old Man Emu 2.5" suspension lift, 1" body lift.....Runs and drives, but very much a project
Interned at Novak Conversions 2 summers ago

Ask me about my 4BT Cummins Motor Mounts!!
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post #23 of 134 Old 12-06-2011, 07:23 AM Thread Starter
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just ordered a saw-z-all and drill kit, hard to believe I am 23 years old, built 3 jeeps, and I just bought my first set of cordless tools.... It is a good thing my dad had so many tools haha.

Hopefully I get around to cutting and drillin this weekend

Jeep 1:Used to have a 93 YJ 2.5l- 3.5" Black Diamond, Chevy TBI 5.7l V8, SM 465 4 speed, 8.8 rear( 4.10, L/S), rhinoline, Mile Marker 9000, NP 231, Had to sell it due to college
Jeep 2: 89/91 YJ, 4BT Cummins, NV4500, NP 231, Old Man Emu 2.5" suspension lift, 1" body lift.....Runs and drives, but very much a project
Interned at Novak Conversions 2 summers ago

Ask me about my 4BT Cummins Motor Mounts!!
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post #24 of 134 Old 12-09-2011, 07:55 PM
ROWA
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youngjeeper11,
I was planing the same swap, I got my Cherokee heater box from a 93. I had to look at four other Cherokees to find a blower speed control switch that was not burnt at the plug.
Are you planing on using the heater water control valve?
I have not taken the heater out of my YJ yet, looking forward to your install.
Keep us posted

94 YJ Sahara

The best Engineering is no match against natural Stupidity.
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post #25 of 134 Old 12-09-2011, 10:46 PM
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Dang I had an xj in my hands. I did not even think about pulling the hvac out of it before I sent it to the big scarp pile. Then I could hear the wife, "you are collecting mmmoooorrrreee JUNK!" She just does not under stand.

A 89 yj with a 4.0 aw4 sye out of an 92xj. Now the hard part is done time to get it up in the air just a bit. Working on 8.8 with 3.73 and lsd for the rear. and new D30 hp with 3.73 .
For those who have not figured this out I'm old school but can handle the new too.
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post #26 of 134 Old 12-10-2011, 08:22 AM Thread Starter
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Quote:
Originally Posted by ROWA View Post
youngjeeper11,
I was planing the same swap, I got my Cherokee heater box from a 93. I had to look at four other Cherokees to find a blower speed control switch that was not burnt at the plug.
Are you planing on using the heater water control valve?
I have not taken the heater out of my YJ yet, looking forward to your install.
Keep us posted

hmmm, I am unaware of this water heater control valve. Can you explain?

I was planning on heading back to the junkyard today to grab some odds and ends, and to take a better look at how they XJ system works, but up til now I was planning on hooking up the 2 heater hoses, the two ac hoses, vacuum lines and wiring and that was it.(and the compressor condenser ect, but thats for another weekend)

However I got roped into being a tutor today so I am just studying wiring diagrams in the library

Jeep 1:Used to have a 93 YJ 2.5l- 3.5" Black Diamond, Chevy TBI 5.7l V8, SM 465 4 speed, 8.8 rear( 4.10, L/S), rhinoline, Mile Marker 9000, NP 231, Had to sell it due to college
Jeep 2: 89/91 YJ, 4BT Cummins, NV4500, NP 231, Old Man Emu 2.5" suspension lift, 1" body lift.....Runs and drives, but very much a project
Interned at Novak Conversions 2 summers ago

Ask me about my 4BT Cummins Motor Mounts!!
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post #27 of 134 Old 12-10-2011, 08:25 AM Thread Starter
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Quote:
Originally Posted by dodger889 View Post
Dang I had an xj in my hands. I did not even think about pulling the hvac out of it before I sent it to the big scarp pile. Then I could hear the wife, "you are collecting mmmoooorrrreee JUNK!" She just does not under stand.
I know how that is, just be glad your not me living in the city, all my jeep parts and tools are contained in my jeep in the parking lot haha. So I am quite limited on parts that are "hmm I might be able to use that someday"

Jeep 1:Used to have a 93 YJ 2.5l- 3.5" Black Diamond, Chevy TBI 5.7l V8, SM 465 4 speed, 8.8 rear( 4.10, L/S), rhinoline, Mile Marker 9000, NP 231, Had to sell it due to college
Jeep 2: 89/91 YJ, 4BT Cummins, NV4500, NP 231, Old Man Emu 2.5" suspension lift, 1" body lift.....Runs and drives, but very much a project
Interned at Novak Conversions 2 summers ago

Ask me about my 4BT Cummins Motor Mounts!!
youngjeeper11 is offline  
post #28 of 134 Old 12-10-2011, 10:19 AM Thread Starter
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well, after doing some research on wiring, my conclusions are...

A. Frustrated on the lack of wiring diagrams online for Jeep in general
B. I have been searching for decent wiring diagrams since I was 15, its like Jeep never wrote this stuff down in the 90s
C. Even FSM manuals have crappy Diagrams

Im just going to have to get all the wiring harnesses I can on a workbench and figure it out.

I also decided to buy an un-cut under dash and engine wiring harness for a newer YJ, Not neccessary for this swap by any means, but my carb'ed YJ harness is cut up, and does not have any provisions for A/C.

The fuel injected harness has all the A/C hookups, fuses ect that should make this easier. It also has the "Power Distribution" box, that I am hoping to utilize to re-wire everything to make my 4BT seem more "Factory"

The power distribution box has fuses and relays that I can re-assign to my fuel shut off solenoid, Vacuum pump, blah blah blah.

Now I am rambling....

Basically, I think the best way to do this is to get all the wiring harnesses I can together, and slowly cut out what I dont need, and wire in what I want....

Any recommendations on a manual that has good wiring diagrams? Everyone says Chiltons, or any number of those manuals at autozone, but their diagrams are very generic.

Jeep 1:Used to have a 93 YJ 2.5l- 3.5" Black Diamond, Chevy TBI 5.7l V8, SM 465 4 speed, 8.8 rear( 4.10, L/S), rhinoline, Mile Marker 9000, NP 231, Had to sell it due to college
Jeep 2: 89/91 YJ, 4BT Cummins, NV4500, NP 231, Old Man Emu 2.5" suspension lift, 1" body lift.....Runs and drives, but very much a project
Interned at Novak Conversions 2 summers ago

Ask me about my 4BT Cummins Motor Mounts!!
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post #29 of 134 Old 12-10-2011, 11:10 AM
Leans93
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Interesting idea. I hope it works out. If so I may go this route as all my cables are broken and replacements are $30 a piece. Plus having the A/C closer to the face would be a bonus.

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93' YJ 4.0L AX-15, 4" Pro Comp lift, 3/4" shackles, 1" BL, 33x12.5x15 BGF MT's, and some other stuff


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post #30 of 134 Old 12-10-2011, 06:57 PM Thread Starter
youngjeeper11
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Made it to junk yard today. I figured out what valve you are talking about! And after checking out a few intact Cherokees I realized I need that valve to block hot coolant flow to the heater core while the ac is on. So yes I plan to use the valve. Its easy to hook up, and there is just 1 vacuum line to run to the valve. The newer Cherokees have a much nicer looking valve so that's the one I plan to use. Also decided I needed a vacuum storage tank thing. I'll post pics tomorrow!

Jeep 1:Used to have a 93 YJ 2.5l- 3.5" Black Diamond, Chevy TBI 5.7l V8, SM 465 4 speed, 8.8 rear( 4.10, L/S), rhinoline, Mile Marker 9000, NP 231, Had to sell it due to college
Jeep 2: 89/91 YJ, 4BT Cummins, NV4500, NP 231, Old Man Emu 2.5" suspension lift, 1" body lift.....Runs and drives, but very much a project
Interned at Novak Conversions 2 summers ago

Ask me about my 4BT Cummins Motor Mounts!!
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