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Phoenix



Member Since: 16 May 2022
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Evap temps should generally be <7deg. C. regardless of climate control temperature settings, it's the job of the air blend actuator to, well, blend the air to the required temperature to reach the setpoint.
Pressure readings look low but without the low side reading (which would have to be taken with a gauge) they're not really a good diagnostic aid if the refrigerant charge is correct.
The aircon compressor clutch isn't PWM controlled so as long as it's drawing current (700 - 900mA is the correct range but can vary 'a bit' outside that range with no issues) the actual measurement is irrelevant to diagnostics the high side pressure should increase with the clutch locked, decrease with it unlocked, the high and low side pressures should be approximately equal within a few minutes of the clutch being disengaged, the time taken will be longer with a high ambient / evap differential due to stored heat in the refrigerant having to disperse in the pipework rather than the condenser.

Has your refrigerant charge been checked correctly? - i.e. recover, leak check & recharge, it has been known for the charge label to be read incorrectly and the charge for dual-zone systems to be assume to be the correct one. Overcharging can give effects similar to undercharging as there isn't sufficient expansion room in the system for the refrigerant to 'gas' and lose it's heat.

Post #635586 27th Jun 2022 5:22pm
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JayGee



Member Since: 27 Jul 2021
Location: London
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United Kingdom 2012 Range Rover Vogue 4.4 V8 Orkney Grey

I've booked mine into Kwick Censored Fit tomorrow for a test and recharge but I strongly suspect the compressor RCV valve is the problem. At this stage I'm not sure if it's worth spending around £1000 to have a new compressor fitted. 2012 TDV8 Vogue (L322)

Post #635588 27th Jun 2022 6:17pm
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Phoenix



Member Since: 16 May 2022
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Aircon working 'ok' with a lower ambient is typical for low refrigerant charge, it isn't 'ok' of course, it's just that the lower ambient puts less of a load on the system as there's less heat to recover. Same goes for flinging it round corners, the liquid that is in the system gets thrown around and temporarily increases the system pressure against the orifice, so there is a high/low pressure differential, which is how the system works.

Post #635595 27th Jun 2022 6:49pm
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kevinp



Member Since: 28 Sep 2019
Location: Telford
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United Kingdom 2011 Range Rover Autobiography TDV8 Santorini Black

Interesting Phoenix, perhaps mine is just low on refrigerant then. It mirrors everything you have pointed out.

Post #635602 27th Jun 2022 7:42pm
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JayGee



Member Since: 27 Jul 2021
Location: London
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United Kingdom 2012 Range Rover Vogue 4.4 V8 Orkney Grey

I also have this fault
B102E-11 ( 68 ) Air quality sensor - General electrical failure - circuit short to ground
This seems to refer to the recirculating feature but also may be something else? 2012 TDV8 Vogue (L322)

Post #635607 27th Jun 2022 8:26pm
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Phoenix



Member Since: 16 May 2022
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kevinp wrote:
Interesting Phoenix, perhaps mine is just low on refrigerant then. It mirrors everything you have pointed out.

Aircon systems are not complex beasts, they haven't changed in basic design since 1933, patented in 1935 and brought to the masses by Packard in 1939. It is, of course, just physics - but the operating principle is often misunderstood due to the enhancements and complexity of the air handling systems it is installed in.

BTW, it's not my main systems speciality, just one I'm very familiar with, especially at this time of year.

Post #635608 27th Jun 2022 8:43pm
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Phoenix



Member Since: 16 May 2022
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JayGee wrote:
I also have this fault
B102E-11 ( 68 ) Air quality sensor - General electrical failure - circuit short to ground
This seems to refer to the recirculating feature but also may be something else?

That is normally a transient fault and only affects the auto recirculation function - it will be overridden by a high aircon demand (or manual recirculation request) which will close the recirculation flap to aid fast cooldown to setpoint, once 80% of setpoint is achieved, then the recirculation flap will reopen, unless the air quality sensor prevents it.

Post #635609 27th Jun 2022 8:47pm
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JayGee



Member Since: 27 Jul 2021
Location: London
Posts: 2568

United Kingdom 2012 Range Rover Vogue 4.4 V8 Orkney Grey

731g recovered, 880g recharge +10ml PAG oil. No leak with 20min vacuum leak test.
heater set to 22 deg

Click image to enlarge


heater set to 16 deg
Click image to enlarge

Seems to be working better with lower condenser temp, higher system pressure and less current draw but no idea if it's working correctly. 2012 TDV8 Vogue (L322)

Post #635641 28th Jun 2022 12:10pm
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Phoenix



Member Since: 16 May 2022
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What was the ambient temperature when those screen shots were taken?

Post #635647 28th Jun 2022 2:20pm
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JayGee



Member Since: 27 Jul 2021
Location: London
Posts: 2568

United Kingdom 2012 Range Rover Vogue 4.4 V8 Orkney Grey

18deg 2012 TDV8 Vogue (L322)

Post #635648 28th Jun 2022 2:20pm
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JayGee



Member Since: 27 Jul 2021
Location: London
Posts: 2568

United Kingdom 2012 Range Rover Vogue 4.4 V8 Orkney Grey

Not fixed......
Aircon on max and 16 deg and it's heating up the car to over 30 deg with an 18 deg ambient temp. After about 5 mins the system started working and the evap temp started to drop and I could feel cold air but it then went back trying to cook me alive.
Going to ring round a few places tomorrow for quotes to get the compressor replaced. 2012 TDV8 Vogue (L322)

Post #635673 28th Jun 2022 6:19pm
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mjdronfield



Member Since: 04 Nov 2011
Location: Derbyshire
Posts: 7605

United Kingdom 2011 Range Rover Vogue SE TDV8 Buckingham Blue

Sounds like mine….. delayed air con….

I had mine recharged and the chap couldn’t understand why it then wouldn’t come on until he moved the car from the unit to the car park…. He couldn’t understand why it only seemed to come on outside. Knowing what we all know now, it was nothing to do with that… just the valve issue…..

I’ve yet to get an answer as to whether different makes of compressor still have the same issue, ie will fitting a different make fix the issue forever…… or will replacing like for like mean you will prob have the issue again at some point…

Thumbs Up 2011 Range Rover Vogue SE 4.4 TDV8

Previous cars :
2003 Range Rover Vogue TD6
1999 Discovery Td5 ES
1995 BMW M5 3.8 6 speed
1992 Range Rover 3.9 Efi Vogue
1992 BMW M5 3.8
1988 BMW 735i SE
1989 Ford Sierra XR4x4 2.9i
1981 Ford Fiesta Supersport

Post #635680 28th Jun 2022 7:20pm
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JayGee



Member Since: 27 Jul 2021
Location: London
Posts: 2568

United Kingdom 2012 Range Rover Vogue 4.4 V8 Orkney Grey

I'll not be keeping the car that long but don't fancy going through summer with no aircon. At the moment I get cooler air by turning off the aircon so not sure what's happening there? 2012 TDV8 Vogue (L322)

Post #635681 28th Jun 2022 7:23pm
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DrRob



Member Since: 16 Apr 2015
Location: Petersfield, Hampshire
Posts: 4201

United Kingdom 2011 Range Rover Vogue SE TDV8 Buckingham Blue

It's a long winded job to change the compressor. Make sure you take it to a specialist Thumbs Up 2011 4.4 TDV8 Vogue SE Buckingham Blue with Ivory and clear glass = "Rory"
New Defender D300 90 on order so "Rory" will be going to a new home....!
1974 Series 3 Lightweight = "Millie"
My preferred specialist: www.glenrands.co.uk
--------------------------------------------------

Post #635682 28th Jun 2022 7:29pm
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JayGee



Member Since: 27 Jul 2021
Location: London
Posts: 2568

United Kingdom 2012 Range Rover Vogue 4.4 V8 Orkney Grey

I've seen the videos and It's just about possible to do it by removing the NS airbox but the workshop way is to remove the fan cowl. If it's the later I'll get them to replace the alternator as well. 2012 TDV8 Vogue (L322)

Post #635685 28th Jun 2022 7:32pm
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