AC drier / switch problem - Defender Source
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  #1  
Old May 14th, 2012, 11:46 AM
gasman
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Scott
1997 D-90
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AC drier / switch problem

Hi all,
I am hoping someone can help with a wiring issue I am having with my AC.
I have a 1997 D-90, auto with 4.0 v-8. My ac hose was leaking, replaced it and ordered a new drier. The new drier replaced the old drier and now has fine thread where the old one had coarse threads. Old cut out switch will not work with the new drier. So I ordered a new cut out switch for the new updated drier, from local dealer on both. The new switch shows up and is updated also. It does have fine threads, but it has a harness, 4 wires and two plugs built into it. The new switch has two blue wires going to the same connector and two black/green wires going to the other connector, but no diagram on how to hard wire it up to the truck harness. I can not get a diagram for the life of me on where to but these up.
Please, someone help me with this. I can not find an old style drier either to bypass the new, updated one.
The new switch number is 8510066 and new drier number is stc 4851.
Surely I'm not the only one to run into this issue.
Thank you in advance.
Scott
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  #2  
Old May 14th, 2012, 12:11 PM
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Sam
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Good luck. I like you have tried to throw parts at this and i still have no ac. Search this forum, plenty of threads. bottom line, im having custom hoses/fittings fitted to make the genuine dryer work.
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Old May 14th, 2012, 02:00 PM
gasman
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Scott
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  #4  
Old May 14th, 2012, 08:07 PM
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AndrewT
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What plugs into the old switch? A connector? What color are the wires going into that connector?

IIRC - This switch just toggles the system on/off if the pressure is too high or too low - meaning you can jumper it and it will always be 'on' so that the pressure switch would never shut off the system. I am not even sure the connection of the wires is critical since the switch itself just opens/closes the connection between the two. Why your switch has four wires is not clear - unless there is a separate cut off for low vs high pressure maybe???

AndrewT
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Old May 14th, 2012, 08:12 PM
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Jason England
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Quote:
Originally Posted by Lesandjes View Post
What plugs into the old switch? A connector? What color are the wires going into that connector?

IIRC - This switch just toggles the system on/off if the pressure is too high or too low - meaning you can jumper it and it will always be 'on' so that the pressure switch would never shut off the system.

AndrewT
Basically without it if you lose your gas you'll screw your compressor.
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Old May 14th, 2012, 08:16 PM
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AndrewT
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Quote:
Originally Posted by leastonce View Post
Basically without it if you lose your gas you'll screw your compressor.
Yes - you can risk greater damage by not using it. I am not suggesting you bypass it forever. But it can be bypassed to get the system running. Its a simple open/closed switch so the wiring to it cannot be that complicated.

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  #7  
Old May 15th, 2012, 07:27 AM
gasman
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Scott
1997 D-90
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It does have one connector going to the old switch.
Wires are blue/white, black, yellow/white and blue/red.
I would like to get the switch wired up correctly, but a temp work around might be a bypass.
The yellow/black and the bue/white go to the ECM. The black goes to the compressor clutch and the red/blue to the ac thermostat.
Thanks for the help.
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