Thread: D4 A/C Compressor issue

You have a new fan coming. It’ll fix your issue. Don’t worry, be happy

Originally Posted by DiscoJeffster

You have a new fan coming. It’ll fix your issue. Don’t worry, be happy

Under 7 days delivered from UK, happy days.

Originally Posted by imaz

Under 7 days delivered from UK, happy days.

Looks like the weather is getting warmer ~25c and it’s gone to ***** again. Eventually gets cooler and now as low as 15c at the vents whilst driving highway speeds, and even that it tapers off. The strange thing is, the rear AC is more colder than the front ever does, and the rears consistent - it’s the same compressor!

Guessing a compressor is likely? Could it be anything else? Txv? The Autoelec who did the regas found it strange behaving during the second diagnosis he did this week. Pointed that compressor would be recommended.

AC Pressure sits at a shy of ~900kpa and as I rev and hold to around 1200rpm, the pressure will go up to around 1.2MPa and the system will start to be cooler at the vents.

Looking at the SDD, max AC pressure is around 3.1MPa, so I would be happy if the AC system pressure sat around 1.5MPa idled...

Anyone have any reading of a working AC system?




I also did a evaporator clean using that HVAC Coil cleaner Pro foam spray by CRC and flush with water through the drain tubes on the front dash , and through the blower access for the rears.

That evap was very dirty,usually that drops off the airflow.

Have a good look at the condenser,is it clean as well?

You need a good AC guy to look at it,one that has done LR work before,could be numerous things that maybe causing the problem.

I wonder if Dazza on here knows a good AC guy,i believe he is in Perth?

These variable compressors can be a pest to diagnose as they don't have an over ride function on the scan tool (that I have found anyway) .
you are monitoring the current to the valve. That will at least give you insight.

If you start the car up and the AC system is set to say 17 and is 30 ambient out, it force it to full stroke, try not to do it in the shed. They have a sunlight intensity thing on the dash, if it goes to full force and still givers that low that's an issue.

My compressor was full of grey death..

I'll go start mine and get you some idle figures

That's with the car off,

With it on and cooling



I used my gauges to check the sensor for accuracy

With me driving it..I added road speed to try and help ya. Also note the different compressor motor current. The first one I didn't pick up was the wrong item. Sorry..



What I remember from diagnosing mine was the compressor current was always at .750amp trying to get a response, now it seems it's never there, even on low this morning never about .6amp.

Happy to take more information this arvo when I finish this job im on and traveling home.

In my opinion experience, the issue is the compressor/valve control combo just stops working randomly. Mine has figures like yours Josh when working but the time it went warm and I got the GAP onto it, you could see the ac was being commanded to full, but nothing was happening.
The figures when that happens are below. And note, mine has a new valve in it so that wasn’t a fix for me. The frustrating bit is when it works, it’s fine.

Gonna be an interesting weekend, gonna tackle this. Will get someone to degas and evacuate the lines tomorrow.

Local supplier has the compressor in stock for $645. Will also change the receiver dryer also.