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Unread 12-20-2011, 11:17 AM   #61
youngjeeper11
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This is more like what I am thinking. To me I can just wire the thermo stat and LP switch in series to the compressor clutch relay. That is close to how this is set up.

mustangairconditionercontrolwiringschematicdiagram.jpg  
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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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Unread 12-20-2011, 01:26 PM   #62
Que89YJ
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Look at this: http://www.myjeeprocks.com/feature/y...-installation/
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Unread 12-20-2011, 09:18 PM   #63
dodger889
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Here is just a personal thought I would run the clutch power through a relay. Remember it can pull about 15 to 20 amps. With that thought in mind I do not think the high and low pressure switches can really take that type of amperage through them. With the relay in the system you can protect the switches and still have the safety factor to protect the compressor. You should not need wide open throttle cut out on your setup. You will not be going that far into the rpm range with a diesel engine vs a gas engine. Here is a modified drawing of what you have are using. Hope this make sense to you.


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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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im just cheap, and cheap makes you creative.
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Unread 12-21-2011, 06:50 AM   #64
youngjeeper11
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Got it, So I basically need to wire the switches to a relay to control the compressor.

This is very similar to how it is already wired, I am really thinking that it will work even without the ECU. I dont think the ECU plays a part in controlling the compressor relay.

Guess I will have to try it. time for some test lights! haha
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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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Unread 12-21-2011, 08:07 AM   #65
dodger889
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Quote:
Originally Posted by youngjeeper11 View Post
Got it, So I basically need to wire the switches to a relay to control the compressor.

This is very similar to how it is already wired, I am really thinking that it will work even without the ECU. I dont think the ECU plays a part in controlling the compressor relay.

Guess I will have to try it. time for some test lights! haha
The ECU only kicks up the load factor for the engine. Since you are doing this on diesel engine I doubt that it will effect it has much has a gas engine would. You have an engine that has a lot of low end torque so the AC compressor will not be a load factor. Are you running an electric fan?? Then you might want to add a circuit to run that when you engage the AC.
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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.
Quote:
Originally Posted by bigsquat View Post
im just cheap, and cheap makes you creative.
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Unread 12-21-2011, 09:07 AM   #66
youngjeeper11
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Ok, that was really my question, as to if the ECU controlled the actual AC sytem at all, or are the wires going to the ECU from the AC system just telling the ECU what the AC system is doing.

I can just add a relay to the power dist center for the ac fan.
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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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Unread 12-21-2011, 09:21 AM   #67
Que89YJ
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The ecu cut out the clutch so yes it had some control.
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Unread 12-21-2011, 11:19 PM   #68
dodger889
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The ECU controls the relay to the fan clutch and The ecu mainly kicks in a few more rpm to the engine to compensate for the power draw from the engine when the AC clutch is engaged. Since you are using this on a diesel engine the governor will react to the power draw. Yes it is engaged at idle and then it is set for a maximum output rpm. Since the ECM will not be controlling anything with the engine. You will bypass the ECM control and just run the AC like they use to do with the big V8 engines.
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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.
Quote:
Originally Posted by bigsquat View Post
im just cheap, and cheap makes you creative.
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Unread 12-22-2011, 05:28 AM   #69
youngjeeper11
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Quote:
Originally Posted by dodger889 View Post
The ECU controls the relay to the fan clutch and The ecu mainly kicks in a few more rpm to the engine to compensate for the power draw from the engine when the AC clutch is engaged. Since you are using this on a diesel engine the governor will react to the power draw. Yes it is engaged at idle and then it is set for a maximum output rpm. Since the ECM will not be controlling anything with the engine. You will bypass the ECM control and just run the AC like they use to do with the big V8 engines.
did you mean compressor clutch.

That is what I am thinking.

I wish I had some time to sit down with the wiring diagrams again. Maybe over the holidays....
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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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Unread 12-22-2011, 07:53 AM   #70
dodger889
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Quote:
Originally Posted by youngjeeper11 View Post
did you mean compressor clutch.

That is what I am thinking.

I wish I had some time to sit down with the wiring diagrams again. Maybe over the holidays....
opps yes AC compressor clutch...

If you look at the jeep wiring diagrams they are going to add more confusion into this. Because they are drawn for a gas engine with a ECM or ECU in them. ECM when it come to the gas engine and AC is to add power to compensate for the extra load applied to the engine to keep the rpm up. If it did not do that the engine would bog down. Where the diesel recovers from a load being applied to it at idle.
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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.
Quote:
Originally Posted by bigsquat View Post
im just cheap, and cheap makes you creative.
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Unread 12-22-2011, 08:49 AM   #71
youngjeeper11
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Right, but I am trying to incorporate as much of the stock harness as possible. I dont want to run all new wires. So if I can get away with cutting some wires out, and running 1 or 2 extras thats what I am going to do.

I do not think it is all that complicated, I wired a standalone AC on a YJ before, and it was like 4 wires total. Wish I could remember how I did it.

The complexity only comes in trying to cross an XJ and YJ harness, and bypassing the ECU.
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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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Unread 12-22-2011, 10:06 AM   #72
dodger889
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In your case it would be much easier to rewire or re-utilize then trying to use what is there in it present form. One thing is getting the wiring down to what you need for your engine and ACCY. to be used. Which you have done with the engine to even get it to run. Now when adding to that taking what is left in the harness should not be that hard because when you take out all that controlled the engine components there should not be a lot left.
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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.
Quote:
Originally Posted by bigsquat View Post
im just cheap, and cheap makes you creative.
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Unread 01-05-2012, 06:51 AM   #73
twiisted71
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youngJ Have you had anymore progress on this? Have you determined what the fit is really going to be like along the firewall and behind the dash?
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Unread 01-05-2012, 08:12 AM   #74
youngjeeper11
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Not yet, kinda been sidetracked with the holidays, and its getting cold out haha. But it is supposed to be nice here in VA this weekend and I finally got a battery saw-z-all and drill (merry christmas to myself) so I might do some cutting saturday. I am anxious to try it. I will let you know for sure!
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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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Unread 01-08-2012, 01:39 PM   #75
youngjeeper11
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Well I got it to fit! It ended up being a lot more difficult than I anticipated though. I ended up with a big hole in my firewall....

I also did end up having to move my battery, not too big of a deal though.
404660_10150451143862583_687697582_8932124_1325727885_n.jpg   408992_10150451144287583_687697582_8932127_1617443393_n.jpg   378784_10150451146547583_687697582_8932150_1961967288_n.jpg   396997_10150451144792583_687697582_8932132_76864611_n.jpg   381971_10150451145592583_687697582_8932140_1508259832_n.jpg  

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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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