Testing A/C Compressor - Nissan Xterra Forum
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#1 Old 07-13-2011, 10:38 PM
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Testing A/C Compressor

Yes, another A/C question... For the last year or two my A/C has not worked on my 2002. Since I only drive it once in awhile I kept pushing it off, but it is finally time to fix it.

Initially I thought it was an electrical problem, but it turned out my multimeter was bad. I discovered this afternoon that the high pressure hose has a gash in it and it appears it somehow hit the flywheel on the front of the compressor and sliced it open. See attached pics.

I got voltage at both fuses in the panel under the hood and at the dryer. How do I confirm the compressor is still good and didn't get toasted when the high pressure line blew? I'm assuming the low pressure switch on the dryer turned the compressor off before this happened, but I want to confirm before I order a new hose and dryer. I also put a guage on the low pressure port and it was at zero (not suprising).

If the compressor is still good, I replace the high pressure line and dryer, run an A/C vac then recharge the system right?

Thanks in advance for the help.
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#2 Old 07-13-2011, 11:00 PM
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Open your hood, start your truck. Turn on the AC on high and put it on defrost. Watch for compressor clutch to kick in.


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#3 Old 07-15-2011, 03:51 PM
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I tried that and the compressor did not kick on, but I don't see how that is any different then turning the A/C on high. Since there is a low pressure switch, wouldn't that keep the compressor from turning on if all the freon escaped? I guess I'm just trying to figure out a way to confirm that the compressor works before I order the high pressure hose and dryer... Any ideas?
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#4 Old 07-15-2011, 05:50 PM
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No, it should turn on. You can always put an amp clamp around the trigger wire.


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#5 Old 07-15-2011, 07:31 PM
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You can always jumper the connector on the low pressure switch to test the comp. I'm pretty sure James is right about defrost though. There's an AC switch that closes when you go to defrost, but with out getting out the schematics, I'm not certain it will bypass the low pressure switch.
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#6 Old 07-15-2011, 09:01 PM
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Jump the switch on the drier if u don' have freon in its the only thing that will engage the clutch



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#7 Old 01-13-2012, 09:39 PM
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so if you jump the low pressure switch connector the compressor should engage? did that today and it was a nogo. i cant do the defrost setting due to the fact that i have disengaged the micro switch behind the knob.

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#8 Old 04-11-2012, 01:45 PM
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Bring this one back from the dead... I didn't get around to fixing the A/C last year, but I need to get it running ASAP...

I spent some time last night reading thru the repair manual and attempting to troubleshoot the system. Here is what I found:

- I could not get the clutch to engage when I jumped the wiring running to the dryer.
- I ran a wire from the battery to the compressor and the clutch engages.
- I checked the A/C fuses under the hood and they are in good shape. I also used a multimeter to confirm both fuses are getting power.
- The power lead running to the compressor is not getting any power.

Any idea where to power lead running to the compressor originates? I tried to track it down, but it joins a large bundle of wires and goes thru the center of the firewall.

Any other things I should check?
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#9 Old 04-11-2012, 01:52 PM
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Check to see that there is refrigerant in it.if there is none it won't turn on

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#10 Old 04-11-2012, 02:09 PM
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I know the system is empty because I have not replaced the high pressure hose yet.

If I jump the dryer and still not getting power to the compressor lead, any idea what I should check next?

What about if I'm not getting power to the dryer?

I looked at the wiring diagram, but could not make sense of it.
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