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Compressor runs constantly
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JSMDave
 


Member Since: 02 May 2012
Location: Sheffield
Posts: 2

2006 Discovery 3 TDV6 Base 7 Seat Manual Stornoway GreyDiscovery 3
Compressor runs constantly

I've been getting the suspension warning light for a week or so on my Disco 3. I pulled fuse F26 then left the car overnight and the front end dropped both sides. I dismantled and cleaned the front valve block. After this the warning light still came on but when I again pulled the fuse and left it overnight nothing dropped at all. Next step was to buy and fit a compressor repair kit consisting of piston seal, and drier components. Car pumped up quickly but after a few minutes light came on again. When cold it takes about five minutes before light comes on, after that when I turn ignition off and on again the light comes on in a few seconds. The compressor runs continuously and i suspect the warning light is coming on because the compressor is overheating.
I'm assuming that there is a leak or a faulty pressure sensor on the compressor. I've read that the exhaust valve can leak but unfortunately the kit didn't have replacement bits for this and I wasn't aware of this when I overhauled the compressor so didn't touch that part of it.
Does anyone have any ideas how to diagnose the problem? I was thinking of buying a i930 diagnostic tool does anyone know if this will diagnose this type of issue?
Thanks
  
Post #189446527th Dec 2017 8:21 pm
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Pete K
 


Member Since: 15 Jan 2016
Location: GL
Posts: 3030

England 2005 Discovery 3 TDV6 HSE Auto Rimini RedDiscovery 3

Check pressure switch and it's wires ???
  
Post #189446927th Dec 2017 8:28 pm
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M3DPO
 


Member Since: 22 Sep 2010
Location: Notts.
Posts: 4921

England 2014 Discovery 4 3.0 SDV6 HSE Lux Auto Corris GreyDiscovery 4

Change the relay in CJB.
 It can when others can't,
It will when others won't,
It goes where others don't. 
 
Post #189447627th Dec 2017 8:36 pm
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JSMDave
 


Member Since: 02 May 2012
Location: Sheffield
Posts: 2

2006 Discovery 3 TDV6 Base 7 Seat Manual Stornoway GreyDiscovery 3

Thanks for that Pete K and M3DPO, I was thinking of getting a new relay next so will order one.
How would I check the pressure switch? Does anyone know where I could get a wiring diagram of the compressor plug?

Thanks again
  
Post #189448227th Dec 2017 8:50 pm
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M3DPO
 


Member Since: 22 Sep 2010
Location: Notts.
Posts: 4921

England 2014 Discovery 4 3.0 SDV6 HSE Lux Auto Corris GreyDiscovery 4

Thumbs Up in the meantime swap it with the Heated front screen relay, which I believe is next to it.
Did you check the condition of the exhaust valve?- they are only a simple rubber plug on the end of a compression Spring, LR do a replacement kit, they are renowned for failing on vehicles that have been stood for a period of time as they stick down and then break up when used. They are located under a 17mm stud on the compressor.
 It can when others can't,
It will when others won't,
It goes where others don't. 
 
Post #189448427th Dec 2017 8:53 pm
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Pete K
 


Member Since: 15 Jan 2016
Location: GL
Posts: 3030

England 2005 Discovery 3 TDV6 HSE Auto Rimini RedDiscovery 3

I assume the compressor doesn't run 24 hours a day.
Else you would have a flat battery
  
Post #189450627th Dec 2017 9:52 pm
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John C
 


Member Since: 28 Aug 2007
Location: East Yorkshire
Posts: 3033

United Kingdom 2006 Discovery 3 TDV6 SE Auto Cairns BlueDiscovery 3

Does the compressor run once you’ve turned the engine off? If so, will likely be the relay.
 TDV6 SE Auto, Cairns Blue,
Club 230K
Club AT2, Club Lenser, Club Trangia, Club Labrador, Club Chainsaw, Club Yorkshire Wink
...and club Replacement Engine 
 
Post #189454627th Dec 2017 10:48 pm
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Pete K
 


Member Since: 15 Jan 2016
Location: GL
Posts: 3030

England 2005 Discovery 3 TDV6 HSE Auto Rimini RedDiscovery 3

the pressure switch has 3 wires

yellow/black 5v
yellow/pink ground
orange/grey pressure output
  
Post #189455427th Dec 2017 11:16 pm
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