Ive searched but can't seem to find a similar problem to mine. Please bear with me!

Firstly about a month ago i had the air con regassed due to it not working, and the mechanic(air con specialist) told me that there was no pressure in the system. But he put it in a vacuum and leak tested to find all ok.
The car was gassed and worked for around 2 weeks.
Then it suddenly stopped again and i got a system pressure fault on my iid.
I got the mechanic back to find the leak as he had put dye in the system yet it had pressure and the right amount of gas yet wouldn't work?
So this mechanic told me the compressor was probably gone and i needed to get it changed.
I then put the car into a garage and asked them to look at the air con whist it had a service and they told me the gas levels were fine and they emptied the system and refilled it and then it worked again until today!
I had the same low pressure fault but i can't find a leak although the pressure hasn't been tested.

So what I'm asking is could it be the pressure sensor? and how would i test this? or is there a relay that control the air con that could be faulty?
Thanks Sam RRS Autobiography SDV6 19
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The pressure sensor reads the high side of the system

It stops the compressor switching on if it detects their is insufficient static pressure in the system and also if the dynamic pressure becomes too high.

As there is a charge remaining in your system, it could be a faulty sensor OR it could be that when operating, the pressure is getting too high and the sensor is correctly sensing to stop the compressor.

If you can read the live values with your IID of both system pressure together with evaporator temperature and post them in this thread I can give you a better idea of the problem

Reasons for too high a system pressure are...

Contamination of the refrigerant in the system i.e. Air present
Insufficient airflow across the condenser, so it's dirty or the fan is not working correctly
Overcharging, too much refrigerant in the system

Thanks godivanige I will check these tonight and report back with what I've found, appreciate your knowledge.  RRS Autobiography SDV6 19
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Hi here are the live values, these are about 3 minutes after a restart from a 20 minute drive, thanks Sam.

 RRS Autobiography SDV6 19
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Did you clear any outstanding faults prior to taking these readings and if so, did the pressure fault immediately reappear? 4.8 bar as a static pressure (I.e. Equalised system pressure with the compressor not running) is perfectly fine.
In a working system, it would be expected to see the evaporator temp drop to under 10 Celsius within three minutes and the system pressure rise to over 7 bar.
Something is stopping the system working though the current draw for the compressor clutch is showing that it is definitely energised. I would say suspect compressor but as you said, it was working ok after a second recharge.

??? Hmmm. Strange

Can't be a seized compressor, that would throw the belt off which would be obvious as you would lose power steering. Let me know if there are any fault codes still present and post up what they are.

Hi, there were no faults listed as i cleared them last night whilst trying to figure out what was wrong and they haven't reappeared? All seems very strange then if the values are correct is there a relay? or anything trivial it could be?
Or does it look like a compressor fault? RRS Autobiography SDV6 19
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Check the compressor is turning, with the clutch energised, you should see the centre part of the clutch spinning. If it isn't energised, the pulley around the clutch will be turning with the belts but the centre will be stationary. The clutch is powered by a relay. It's a little awkward to see on a V8, a torch and a mirror will help. Be careful of the fan/belts

If the compressor is spinning then the figures you have posted would indicate any one of the following

Low on refrigerant
Compressor not pumping due to internal failure
Partially blocked receiver drier

A colleague had a very similar problem to this, and dealer changed the Compressor and it's been fine since. Mind you even if it was also/or a sensor would they tell you?
I'm not sure if there is a way to check the compressor is working properly?
I'm not saying that's the problem with yours, but other than getting a specialist to check it, unless under warranty?
It's to expensive just to switch over, and it does sound intermittent
Sorry can't be of any other help, sounds most annoying.  John

RRS MY12 SDV6 HSE. Sumatra Black/Ebony & Walnut + Dynamic Pack, + Cold Climate Pack + Memory Pack, Digital TV/DVD, Premium Leather, Cornering Lights, Cooler/Fridge Box, & most Options.

@ godivanige Thanks very much i'll check tomorrow as I'm currently watching my daughter swim, any ideas where about it is or is it a case of following the pipes? i take it somewhere on the auxiliary belt.

@jonski thanks for the input its all welcome  RRS Autobiography SDV6 19
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Looking into the engine bay, it's on the right just under the power steering pump.

http://www.rrsport.co.uk/gallery/albums/us...20Belt.pdf

Number 8

Thank you very much for that picture i had been looking at the dynamic response pump  RRS Autobiography SDV6 19
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Right by looking at the compressor the outside is spinning but the inside is not?
Am I right now that the clutch isn't energized.
Is there a way of checking the relay that feeds this? Or shall I check it to see if power is getting down to it? Or am I looking at replacing the compressor?
Sorry to keep banging on but it's driving me mad!!
Thanks very much Sam RRS Autobiography SDV6 19
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Hi Sam

There is a possibility the clutch could be at fault but it is highly unlikely, it's just a big electromagnet and they rarely fail, so the chances are your compressor and clutch are fine and you either have a control issue, or a broken wire somewhere.
I don't know the relay numbers etc for the RRS, you'll benefit from someone who can find you a wiring diagram but basically, the ventilation ecu will energise the relay for the clutch which puts the 12v feed to the one wire that goes into the compressor.
First find out if that relay is being energised by the ecu and if it is, then what is happening to the feed to the clutch? The feed to the clutch will be fused but as your fault has been intermittent, the fuse is probably ok. Check the connector at the compressor, they can sometimes corrode and break the feed. You'll need to drop the undertrays to get access unless you can somehow get in via the O/S wheel arch.
If you do find 12V at the wire into the back of the compressor, then yes, the clutch magnet has failed and you will need a new compressor, but as said, this is very rare. Compressor failures are usually a complete seizure or mashed up pistons/swash plate internally, resulting in poor compression of the refrigerant.

Before you do any of this though, check again for any stored faults as if there is one stored, it will likely prevent the ecu from powering the clutch relay until it has been cleared.

Hi Nige, thanks very much for the advise, sorry its took a while to respond. I've had a look at the wiring that all look intact where i can see it.
I did have a fault code back saying low pressure? and when i put it on the iid I've got this?
see next post RRS Autobiography SDV6 19
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 RRS Autobiography SDV6 19
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