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Troubleshooting air.con system
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jonnyboy54321
 


Member Since: 14 Jul 2012
Location: surrey
Posts: 121

United Kingdom 2013 Discovery 4 3.0 SDV6 GS Auto Indus SilverDiscovery 4
Troubleshooting air.con system

Evening all.
Working my way through our new to us 63 plate d4 (gs).
Aircon - is there a diagnosis strategy via GAP IID tool? Ours doesnt engage, the clutch on the compressor freewheels whether ac switched on or off. No faults present using the tool and my ac regasser chap reckons the system is holding pressure. Yes the blower is switched on.
Can rule out (i think) the switch pack as its just been replaced to add heated seat switches.
In the history it had a compressor about 15/20k miles ago.
Not sure where to begin. Lol. Thanks in advance.  
Post #226466729th Nov 2021 11:22 pm
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PROFSR G
 


Member Since: 06 Mar 2017
Location: Lost
Posts: 5043

Ukraine 2009 Discovery 3 TDV6 Commercial XS Auto Stornoway GreyDiscovery 3

There's no clutch, have you looked in "live values" to see what's happening with the system. There should be a fault code if there's a problem. yµ (idµ - eAµ) ψ=mψ

  
Post #226467030th Nov 2021 12:46 am
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jonnyboy54321
 


Member Since: 14 Jul 2012
Location: surrey
Posts: 121

United Kingdom 2013 Discovery 4 3.0 SDV6 GS Auto Indus SilverDiscovery 4

In live values it asks if clutch is engaged or not fyi.

However the system shows zero kpa pressure so I presume that would prevent the clutch engaging yet my chap reckoned it was holding pressure.

Faulty pressure sensor perhaps?  
Post #226481730th Nov 2021 6:43 pm
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PROFSR G
 


Member Since: 06 Mar 2017
Location: Lost
Posts: 5043

Ukraine 2009 Discovery 3 TDV6 Commercial XS Auto Stornoway GreyDiscovery 3

Possibly a faulty pressure sensor if you know for a fact the system is fully charged, but there is no clutch it's a permanent drive variable displacement compressor! Thumbs Up yµ (idµ - eAµ) ψ=mψ

  
Post #226482030th Nov 2021 6:59 pm
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Shadow71
 


Member Since: 19 May 2019
Location: Stoke on trent
Posts: 56

United Kingdom 2016 Discovery 4 3.0 SDV6 HSE Auto Santorini BlackDiscovery 4

Well. 2 weeks ago it had its mot gearbox oil change a re gas etc. I have literally just checked on gap tool and the pressure is 10.9 psi. The clutch also does not engage. History on this is 2 years ago it had a new compressor pipework  
Post #236978527th May 2024 3:41 pm
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