Installing '95 A/C in '94 - Defender Source
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  #1  
Old August 14th, 2005, 07:06 PM
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Jason Herring
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Installing '95 A/C in '94

It's southern Cal, and hot! So I found a used '95 A/C system to install, being under the impression that it would be an easy upgrade. However, I've run into a couple of problems.

1) the passenger footwell unit seems to interfere with the ECU, not allowing enough clearance behind it so that it can be mounted - is this actually the same system on a '95 and a '94, or am I in for a BIG headache? The underhood components all seem to bolt right up. Any suggestions? I hate to think about trying to relocate all that junk under the seat... it doesn't look like the wires will reach.

After doing some reading, I see that there are different types of units -- Davia, Wynn, etc. Do I have the wrong type to fit my truck?

2) The wiring harness on the '95 had two extra connectors which don't seem to be present on the '94. Looking at wiring diagrams, besides ground/fuse/etc the wires that concern me are one which is labeled ECU -> fan, and another which is ECU -> compressor. I am guessing that one wire allows the ECU to turn on the auxiliar fan depending on engine temp, and the other allows the ECU to turn off the compressor in the case of wide-open throttle. Anyone know with more certainty what this wires are, and what are the implications of not connecting them?

Thanks!
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  #2  
Old August 15th, 2005, 12:44 PM
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Well I can understand the the ECU being in the way as the ECU is under the seat in a 95. But I only thought the 97 system connected to the ECU? Maybe you have a 97 system?
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  #3  
Old August 15th, 2005, 01:21 PM
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Jason Herring
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I helped remove it from a '95... the '95 wiring harness had these two connectors which we actually snipped off so I could take them to try to tie them into my harness....

In a '94 A/C system how does the unit mount and not interfere with the ECU? I don't think there is enough wire to relocate the ECU under the seat. If that entire housing is different in a '94 I'll be in a real mess...
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  #4  
Old August 15th, 2005, 02:03 PM
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My ECU is still behind the AC unit. I also have the Diavia so that might be why.
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  #5  
Old August 15th, 2005, 02:48 PM
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I have a 94 with the 95 AC. The ECU is located on the side kickpanel right next to the P/S side door.

It is a TERRIBLE place for the AC but that is where it is supposed to go (it is also supposed to go there with the 94 style AC too).

Ron
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  #6  
Old August 16th, 2005, 01:57 PM
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How do I know which A/C unit this is? The only label is on the compressor - "Tama Mfg.", and it's an R-134 system.

The '94 system is different than the '95? How is it different? I would rather not move my ECU and the wiring harness which is there now.. .but with this condenser/fan unit I don't see how that's possible. Maybe the side kick panel location wouldn't be too bad....

I agree, the footroom lost to the passenger sucks, but the other alternative for the A/C is the D-110 style thorugh the vents & everyone says that doesn't cool the cabin very well (I thought about finding one of those...).

Ron, do you have any photos of your A/C system and how your ECU is located? Did you do the install/mounting yourself?
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  #7  
Old August 16th, 2005, 02:06 PM
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Robert Dassler
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Jason,
I have been cleaning the shop today and ran across a set of the ECU relocation Brackets. PM me if you are interested.
Rob
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  #8  
Old August 16th, 2005, 03:45 PM
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I am not sure on pics, but I would just buy the brackets from Rob and go with it. It is REALLY easy to relocate there. No matter what AC system you get, 94 or 95 you have to relocate the ecu to the kickpanel in the same spot.
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  #9  
Old August 16th, 2005, 04:43 PM
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PM sent to Rob.

Ron, ECU's have to be relocated for all '94 A/C installs? Tyler said earlier in this thread that his ECU is behind the A/C system (and in one of the tech articles on this site - changing the PROM chip in a '94, it talks about dropping the A/C system to get to the ECU behind it).

I suppose with the system I purchased that my ECU will have to be relocated to the kick panel - just wondering what else was out there out of curiocity.

Thanks for the info, guys.
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  #10  
Old August 16th, 2005, 05:07 PM
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Jason,
Thanks for the PM...shot you one back. The really early 1994 kits had the ECU located behind the evaporator...stupid place for it. Next generation of A/C kits had the ECU relocated to the kick panel.
Rob
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  #11  
Old August 17th, 2005, 07:45 AM
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Jason I have a 94 with a 95 system. I think you can tell by where the controls are. Here is a picture of mine. The 94 style a/c controls where up under the dash and seperate from the unit. Thats my understanding. My ecu is shown enclosed in the white qt. of oil container. Protects it from water with the bottom cut out for ventilation
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  #12  
Old August 18th, 2005, 12:50 AM
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Interesting. On my 94 with the 94 style AC the computer was relocated. It was my understanding it could be left behind the AC but was not supposed to be left there. I am 99% sure mine was a factory install and was in the mid1400s range. As Campell says if the controls are on the lower part it is the 95 style Wynns systems. Divia had a seperate control panel above the dash where a radio goes on a UK spec truck.

I have had both and since neither worked . . . I can't really comment, but when it was charged up the 94 was cold.
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  #13  
Old August 18th, 2005, 04:14 PM
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Jason Herring
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It looks like I have the same system as pictured above. Thanks to Rob I should have brackets pretty soon and will just relocate the ECU to the kick panel & then it should mount up. There is no way in the stock location the A/C will clear the ECU with this system.

Thanks for the help guys. Now, hopefully, this A/C won't leak and cause my D90 to spontaneously combust (reading that other thread - I think I'll be picking up an extinguisher, too).
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  #14  
Old August 23rd, 2005, 12:48 PM
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Jason Herring
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OK, I have the brackets (thanks Rob!) but the question becomes -- how do they mount on the kickpanel? What is the orientation? Is there a pic/illustration of this anywhere?

It appears that you just drill some holes in the kickpanel and screw them to the panel with self-tapping screws... but, placement and orientation I'd like to get in the factory location.

Does anyone have a close-up photo of their '94 showing the ECU mounted on that kickpanel in enough detail I could try to replicate what they have?

Thanks....
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  #15  
Old August 23rd, 2005, 02:20 PM
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Quote:
Originally Posted by jaherring
OK, I have the brackets (thanks Rob!) but the question becomes -- how do they mount on the kickpanel? What is the orientation? Is there a pic/illustration of this anywhere?

It appears that you just drill some holes in the kickpanel and screw them to the panel with self-tapping screws... but, placement and orientation I'd like to get in the factory location.

Does anyone have a close-up photo of their '94 showing the ECU mounted on that kickpanel in enough detail I could try to replicate what they have?

Thanks....
I'll try to get you a photo tonite. I just removed the A/C from my 94 this weekend. I hope the pic will help.
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  #16  
Old August 23rd, 2005, 06:22 PM
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Hey Tony,
That would be great, thanks.
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  #17  
Old August 23rd, 2005, 06:31 PM
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Here's a pic of my kickpanel w/ECU and another of the condenser I had so you can compare.
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  #18  
Old August 23rd, 2005, 09:25 PM
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For a 95 style that is not where it is supposed to go.
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Old August 23rd, 2005, 11:35 PM
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Tony Fannin
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Quote:
Originally Posted by evilfij
For a 95 style that is not where it is supposed to go.
Ah, well then I guess I can't help. Mine's a '94 with what I assume was a '94 style A/C. I missed the part where it said the A/C unites were different for the two years.
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  #20  
Old August 24th, 2005, 12:14 AM
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Yeah I think mine was further to the right, actually mounted to the right side kick wall. I should be able to get a picture in a few days of it if there is anything left down there.

Follow-up Post:

Actually I did catch the location in some pictures I took the other day when snapping off some better pics of the damage. The red circle shows where mine is and it is mounted on the outer side wall behind that little panel.
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