Ford Ranger Ac Wiring Diagram

09-18-2011, 07:30 AM

Learning to use the forums Join Date: May 2010 Posts: 7

A/C wiring diagram I have a '97 2.3l xlt. I'd like to do some troubleshooting on the wiring for the a/c, but I don't have a decent wiring schematic to use. I have a Haynes manual, but it doesn't help much for this. Any suggestions? __________________ 1997 XLT 2wd, 2.3L, Manual, over 180,000 miles

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09-18-2011, 07:33 AM

Blinded by the light Join Date: Sep 2009 Posts: 7,674

Re: A/C wiring diagram Whats wrong with it?

09-19-2011, 04:43 AM

Learning to use the forums Join Date: May 2010 Posts: 7

Re: A/C wiring diagram I've gone through the obvious checks to the system, including the relay. However, the clutch on the compressor doesn't appear to be getting the signal to engage when the a/c is selected. I have no way of tracing the wiring out without tearing into the wire loom, which I would like to avoid, if possible. __________________ 1997 XLT 2wd, 2.3L, Manual, over 180,000 miles

09-19-2011, 04:46 AM

Blinded by the light Join Date: Sep 2009 Posts: 7,674

Re: A/C wiring diagram Usually it is the low pressure switch. Unplug the LP switch and bridge the two pins together with a paperclip or similar "tool". If it comes on, you'll know it is the switch.

09-22-2011, 11:37 AM

Learning to use the forums Join Date: May 2010 Posts: 7

Re: A/C wiring diagram When I pulled the low pressure plug off I checked the voltage and saw none. I was getting voltage to the high pressure switch, though. I jumped the pins on the switch and heard a "click" in the switch. However, the system still didn't engage. Neither did I have voltage to the compressor. Shouldn't I get voltage to the low pressure switch and the compressor? __________________ 1997 XLT 2wd, 2.3L, Manual, over 180,000 miles

09-22-2011, 06:30 PM

Junkyard Dog Join Date: Sep 2010 Posts: 1,906

Re: A/C wiring diagram Both switches are in series with the cycling switch being on the power side (Purple and Red/Yellow Wires) and the pressure cutoff switch being on the "ground side" (Red/Yellow coming from the cycling switch and DG/O going to the pcm. 12 volts---->Purple wire---->cycling switch--->Red/Yellow---->cutoff switch--->Dark Green/Orange---->PCM when both these switches close 12 volts is supplied to the pcm to tell it to turn on the compressor. __________________ Automotive Electronics Engineer 2000 XLT 2.5L A/T Mods: Explorer OHC Explorer Autodim Mirrors w/ Autolamps Explorer Sport White Face Gauges

09-22-2011, 09:42 PM

Ford Tough Join Date: Jun 2011 Posts: 478

Pm me for diagrams I have alldata if I can help I will __________________ 96 Xlt 2wd 4in rough country lift 31's

10-11-2011, 05:34 AM

gshockxc Join Date: Aug 2010 Posts: 56

Re: A/C wiring diagram Guys, just found this thread, and I'm trying to do the same troubleshooting. Where are the LP and HP switches for the compressor? I haven't worked on AC systems before, and the Haynes manual doesn't do much for me. TIA __________________ 1999 Ranger, Ext Cab 2WD, 2.5 L Sport, 5 speed, 4.10 axle Bedliner, Tonneau cover, no mods, 185,000 miles

11-05-2011, 10:24 AM

Learning to use the forums Join Date: May 2010 Posts: 7

Re: A/C wiring diagram The LP switch will be on the left side (as you're facing the rear) of the engine compartment, and the HP switch will be on the right side, near the compressor. As busy as I've been over the last month and with the cooler seasons creeping up, I haven't been in a big hurry to do more troubleshooting 'til now. With the A/C wiring schematic in hand (thanks killjoy) and advice from Fireranger, I went back through the system and discovered the problem is a bad LP switch. Thanks for all the help! __________________ 1997 XLT 2wd, 2.3L, Manual, over 180,000 miles

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Source: http://www.fordrangerforum.com/electrical-tech/42717-wiring-diagram.html