Member Since: 05 Aug 2020
Location: Sutton Coldfield
Posts: 1277
So topped it up today to 90psi off using the Iid to watch the pressure. Now running at 123 psi when running and the air is no better.
Watching the live values I can see the compressor working though variable amps demand and everything else is responding.
Only thing I can see is what was raised last night by NC1989, the evaporator temp is consistently higher than the outside temp, so will try and take a look at that tonight once the heats gone down a bit.
With a bit of luck, I’ll get it fixed in time for the weather to go back to cold and rainy 2008 HSE Stornoway Grey
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19th Jul 2022 2:24 pm
Nc1989
Member Since: 28 Apr 2015
Location: Doncaster
Posts: 213
I think your issues are the refrigerant charge, it wants recovering and a decent vacuum pulling before recharging properly with known good refrigerant. Your evaporator temperature isn’t dropping because it is starved of refrigerant (not enough in the system).
19th Jul 2022 3:51 pm
Flatlander
Member Since: 20 Jul 2015
Location: Here
Posts: 575
Exactly. Pressure is not a reliable way of measuring the refrigerant charge, only recover, vac & recharge will tell you how much is in the system and how much you've 'lost' - an empty system indicates a leak, refilling a known leaking system is not only bad practice but also illegal.
19th Jul 2022 5:38 pm
dvans
Member Since: 20 Nov 2014
Location: Edinburgh
Posts: 31
Sorry to also drop in on this one but having similar issues.
Had pipework to rear repaired and new condenser fitted. System pressure tested by mobile a/c guy and recharged. IID tool shows ~70 psi which looks right for ~20C. Can't hear anything clicking when switching a/c on off but can see current go from 0A to 150A and sometimes up to 240A. Also see a slight change in pressure but only by 5 - 10 psi.
After driving around for an hour the a/c worked briefly, but only for a few mins then hasn't worked since (with a few hundred motorway miles recently). Pressure checked again today and still good.
Mobile a/c guy reckons it is the compressor, but is there any way to diagnose that and / or differentiate whether it is the compressor or the clutch pulley?
25th Jul 2022 7:20 pm
dvans
Member Since: 20 Nov 2014
Location: Edinburgh
Posts: 31
Comparison values (off/on)
Ext temp - 16.5C/16.5C
Air intake actuator feedback - 1%/1%
Evaporator temp - 20.5C/21C
Sensor voltage 5v/5v
Air con pressure - 63psi/67psi
Right blend actuator position - max cold/max cold
Interior temp - 20C/20C
Left blend actuator position - max cold/max cold
left & right set temp - 14C/14C
compressor/motor current 0A/242A
25th Jul 2022 7:41 pm
Flatlander
Member Since: 20 Jul 2015
Location: Here
Posts: 575
High-side pressure should be ~150psi with system running at 20deg. C. static pressure (i.e. engine off) should be ~70psi (assuming correct refrigerant charge). I highly doubt your current readings are correct, current draw is usually less than 1A, anything more than 30A would probably melt the wiring.
I have seen D3's incorrectly charged with too little or too much refrigerant as it's not immediately clear from the label which system the vehicle is fitted with. The only compressor issues I've seen are the rubber inserts on the drive pulley wearing and causing the aux drive belt and tensioner to 'chatter'. The thermostatic expansion valve can cause problems but not low pressure.
25th Jul 2022 8:37 pm
Green Land Rover
Member Since: 21 Oct 2017
Location: Stourbridge
Posts: 412
I can highly recommend Roadchill in Shirley near Solihull Kevin.
Not sure if he travels as far as your locale though. I went to his premises in June and got my aircon serviced. Cost me £30ish. He does a thorough job Discovery 4 HSE - Aintree Green
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