A/C troubleshooting for a 2007 M35X

Forum for Infiniti M35 and M45, and Nissan Fuga owners.
Posts: 2
Joined: Wed May 13, 2020 12:05 am
Car: 2007 M35X

A/C troubleshooting for a 2007 M35X

Postby cheekymonkey » Thu May 14, 2020 2:22 pm

Hi all,

I have an a/c that doesn't blow cool air. Here's what I know and have done:

1. Pressure is good and there is enough refrigerant in the system. Fans work, so air is being pushed through.
2. The compressor clutch doesn't engage
3. Ran the detailed diagnostic test (turn on engine > audio off > settings > rotate volume knob ) and saw some error "2-23" in the Error History (Detailed). Ironic, as it's not very detailed or helpful. Can't find any references to "2-23" -- anyone know what this error is?
4. The Climate Control test did not return any error, but seemed to be stuck in a loop. Let it run for about 20 mins before I gave up. The magnetic clutch never engaged.
5. Checked the IPDM fuses and didn't see any that were burned
6. Seems the relays related to A/C in the IPDM are integrated so I'd have to replace the whole module if it failed. Sucks. Not sure how you tell if the A/C relay is fried.
7. Looked at the low pressure switch, but not sure how to test it. 
8. Read @Sstupid's post in the FAQ on replacing the electromagnet part of the clutch. Just posted a question on how to check voltage that specific part.
8. I've read conflicting info about the low pressure switch a) checking for continuity and b) bridging jumpers to engage. I took a multimeter to the switch and didn't see any continuity across any of the three pins. I also don't want to jump as there are reports that it may fry critical circuitry. Some say that the ECM/ECU is expecting a 0-5V signal on one of the pins and jumping wouldn't help anyways.

So that's where I'm at now. I'd like to know how to locate the problem. As I see it, we're down to three potential areas: switch, IPDM, or the magnetic clutch. Does anyone know how to troubleshoot any of those areas so I can go through the process of elimination? I bought a switch and I was going to replace it, but then realized I have to evacuate the system, so it would be a bummer if I did that and it wasn't related. The IPDM is anywhere from $50-$100 used, and of course the dealer cost of repairing the compressor clutch is somewhere in the range of $2000. Ouch.

Any tips would be much appreciated. Thanks!

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