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  #1  
Old 05-30-2011, 08:40 PM
menehune menehune is offline
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Default AC wiring

I have a 2000 3.0 XLT automatic and have started to have problems with the AC. It has been evacuated and charged but the compressor will run normal only when it feels like it which is not often. I by -passed the pressure switch and no change. the Ac relay checks okay. When I put 12 volts on the compressor clutch it runs just fine and gets real cold. with the system back to normal the compressor will start once in a great while. I did get it to run normally this morning quite a few times using the AC switch inside but when i drove it later it would not run. I have not been able to locate a good complete wiring diagram for the AC system to try and trouble shoot the problem. Would appreciate any wiring diagram anyone may have as well as any possible things to try and correct the problem. Mahalo Roger
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  #2  
Old 05-30-2011, 08:59 PM
Teg360 Teg360 is offline
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Default Re: AC wiring

i have access to a auto data program i can get a wiring digram for you for you to tomorrow if they have one on there
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2002 Ranger Xlt Ext. Fx4
Mods: AEM Brute Force air intake, Throttle body spacer, dual exhaust, leveling kit, 3in body lift, 15x8 black pacer rims wrapped with 33x12.5xr15 Goodyear Wrangler Duratracs, Hella 500 offroad lights, cobra cb with wilson 1000 antenna, Sony head unit, 500 watt amp with 12inch sub.
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  #3  
Old 06-02-2011, 09:43 AM
evanspridgen evanspridgen is offline
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Default Re: AC wiring

Boy do I love the fourms. I just joined and someone is having the same issue. Been doing this with my volvo for years. I also have the same ac issue and would love some direction as to where to get a wiring diagram. Thanks
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Old 06-02-2011, 10:04 AM
FireRanger FireRanger is offline
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Default Re: AC wiring

I doubt it is the wiring. It is more likely the low or high pressure switch.
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Old 06-03-2011, 08:26 AM
evanspridgen evanspridgen is offline
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Default Re: AC wiring

I have jumped each independently maybe I should jump both to see if it works .....any thoughts??
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  #6  
Old 06-04-2011, 09:17 AM
menehune menehune is offline
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Default Re: AC wiring

I think that will be one of my next steps (if I can find it) good luck let me know how it goes
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Old 06-05-2011, 09:13 PM
menehune menehune is offline
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Default Re: AC wiring

I bypassed both the high and the low switches with not change. I did find that when I energize the ac relay (under the hood) they system works fine.
This led me to believe that the AC switch inside was bad. I did find that there are only four wires to the AC switch and not sure how the switch is wired so I am back to trying to locate the complete wiring diagram for the ac system. I believe someone mentioned that the ECM also has some control on the system I am at the point where I believe it is either the EMC (if it does have control) or the ac switch on the dash. My current plans are to try and wire the ac relay to an alternate switch on the dash (I supply) and continue to try and isolate the real problem. If it is the ECM will really have to consider the cost on that one if the switch on the dash is bad will try and replace it. It is and easy one to get to and remove just heat to easter egg the problem if I can help it. If anyone can give me so help on this wiring or other things to try I would be appreciate it. open to all suggestions. Aloha
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Old 06-05-2011, 11:25 PM
FireRanger FireRanger is offline
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Default Re: AC wiring

There is a purple wire on the HVAC control. 12v on that is the AC demand indication for the computer. The computer controls the AC relay using inputs from the pressure sensors and other parameters.
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Old 06-07-2011, 12:43 PM
menehune menehune is offline
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Default Re: AC wiring

thanks for the purple wire info but what and where is the HVAC contol. Not sure if you saw it but when I place the ground on the ac relay with all other requirements for each pin present on the relay the compressor comes up and system work fine. sounds like this control you are talking about may be missing and the problem. If you can lead me to it hopefully I can correct this problem. appreciate any help you can provide. aloha
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Old 06-11-2011, 10:42 PM
menehune menehune is offline
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Default Re: AC wiring

I now have a couple new problems with my Ranger and its AC problem. I now get a new code of P0117 low input from temp sensor and also seeing a slow leak in the radiator. someone mentioned that the low temp input may be creating the problem with the AC compressor not coming up. I plan on trying to replace that sensor sometime tomorrow and the radiator as soon as I can get one in a couple days. I have put a switch in the dash to ground the AC relay and energize the AC clutch and it all works fine. the one good thing here is cold ac to the floor in the floor position on its switch which the wife really likes ha ha. so there is some good here even though things are not really working correctly. If anyone knows about this temp sensor think please let me know. Thanks still looking for all the help I can get. Aloha
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Old 06-12-2011, 06:50 AM
FireRanger FireRanger is offline
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Default

The purnple wire is behind the HVAC controls on the dash.

[Posted with my Android mobile device using Tapatalk Pro]
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How to: Aux light wiring, relays, & fuses
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Info: HID Projectors
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  #12  
Old 06-13-2011, 01:38 PM
evanspridgen evanspridgen is offline
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Default Re: AC wiring

Ok as I have fun chasing this issue here is where I am at. I suspected the compressor relay well as it turns out it is the same as the windsheild washer pump relay so I switched them ..no joy. Ok so then I popped the cover off of the compressor clutch relay and activated it manually compressor works. Hooked up my gagues and no suction and only 100lbs on the high pressure side. My question is, is there any other valve in the system that would prevent the system from taking freon when I have the compressor running with the relay manually ingagued? I may be at the point where a true AC guy may have to look at this instead of a old gear head.
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  #13  
Old 06-22-2011, 08:13 PM
menehune menehune is offline
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Default Re: AC wiring

Update on my Ranger AC problem. I did find two leaks in the ac system and fix them but no change. I then received a check engine light and when I read that code it was a low input from Temp sensor. I then replaced it as well as a leaking radiator and recharged the ac system and now all is well. the problem was the low input from the temp sensor that was not letting the cpu energize the ac compressor.
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