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JSMDave
Member Since: 02 May 2012
Location: Sheffield
Posts: 12
 
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| Compressor runs constantly |
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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
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 27th Dec 2017 8:21 pm |
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Pete K
Member Since: 15 Jan 2016
Location: GL
Posts: 10355
 
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Check pressure switch and it's wires ???
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| 27th Dec 2017 8:28 pm |
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M3DPO
Member Since: 22 Sep 2010
Location: Notts.
Posts: 8057
 
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Change the relay in CJB. It can when others can't,
It will when others won't,
It goes where others don't.
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| 27th Dec 2017 8:36 pm |
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JSMDave
Member Since: 02 May 2012
Location: Sheffield
Posts: 12
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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
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| 27th Dec 2017 8:50 pm |
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M3DPO
Member Since: 22 Sep 2010
Location: Notts.
Posts: 8057
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 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.
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| 27th Dec 2017 8:53 pm |
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Pete K
Member Since: 15 Jan 2016
Location: GL
Posts: 10355
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I assume the compressor doesn't run 24 hours a day.
Else you would have a flat battery
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| 27th Dec 2017 9:52 pm |
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John C
Member Since: 28 Aug 2007
Location: East Yorkshire
Posts: 3292
 
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Does the compressor run once you’ve turned the engine off? If so, will likely be the relay. 2020 SDV6 D5 HSE, Carpathian Grey +
2022 Tesla Model Y LR... almost Carpathian Grey
Previously : 2005 TDV6 SE Auto, Cairns Blue (288K) - ours for 16 years
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| 27th Dec 2017 10:48 pm |
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Pete K
Member Since: 15 Jan 2016
Location: GL
Posts: 10355
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the pressure switch has 3 wires
yellow/black 5v
yellow/pink ground
orange/grey pressure output
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| 27th Dec 2017 11:16 pm |
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