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dorsetsmith



Member Since: 30 Oct 2011
Location: South West
Posts: 4554

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Post #635942 6th Jul 2017 1:13pm
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xpertoftheseas



Member Since: 05 Jan 2016
Location: Salisbury, Wilts
Posts: 164
United Kingdom 2014 Defender 110 Puma 2.2 XS CSW Aintree Green
Check...
Relay R181. Does it close when you press the AC button?

If Yes - It is a compressor/clutch problem.
If No - The ECM is not allowing the clutch to close due to one or more of the following...

1. No pressure in the AC system,
2. Thermostatic switch is faulty
3. Fuse 7P is blown
4. Fuse 14P is blown

1, 3 and 4 can all be eliminated easily. The only thing after these is the thermostatic switch.

Edit.... its here..




Let us know how you get on.
Simon My 10th Land Rover, but my first Defender.
Post #636084 6th Jul 2017 9:35pm
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Caterham



Member Since: 06 Nov 2008
Location: Birmingham
Posts: 6298
England 2011 Defender 110 Puma 2.4 XS CSW Stornoway Grey
Thanks very much guys. Gonna hopefully find some time to have a look at this tonight / tomorrow. Thank you for the pointers.

Any idea where r181 I located?
Post #637693 15th Jul 2017 6:02pm
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dorsetsmith



Member Since: 30 Oct 2011
Location: South West
Posts: 4554
i may be wrong on 2.4 under driver seat


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now that's sorted, time for western vintage cider Thumbs Up
Post #637704 15th Jul 2017 6:40pm
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Caterham



Member Since: 06 Nov 2008
Location: Birmingham
Posts: 6298
England 2011 Defender 110 Puma 2.4 XS CSW Stornoway Grey
western vintage cider.......from Aldi? - very nice Thumbs Up

thanks for the info.

If I turn the a/c button on I can hear the relay kicking in/out and the fan turn onto speed one (with the fan speed slider being in 'off' position which I believe is normal).

suggests to me the control side of things is ok but the compressor isn't kicking in?

EOS many thanks for;

Check...
Relay R181. Does it close when you press the AC button?

If Yes - It is a compressor/clutch problem.

so compressor / clutch problem. where can I start in terms of trying to resolve?
Post #637767 16th Jul 2017 8:24am
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dorsetsmith



Member Since: 30 Oct 2011
Location: South West
Posts: 4554
check for 12VDC at the plug of compressor / clutch pin to pin in the plug
Post #637772 16th Jul 2017 9:25am
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Caterham



Member Since: 06 Nov 2008
Location: Birmingham
Posts: 6298
England 2011 Defender 110 Puma 2.4 XS CSW Stornoway Grey
nothing between pins (well female pins) and nothing between either and earth?

back to the wiring diagram? ..................
Post #637796 16th Jul 2017 1:18pm
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Caterham



Member Since: 06 Nov 2008
Location: Birmingham
Posts: 6298
England 2011 Defender 110 Puma 2.4 XS CSW Stornoway Grey
dorsetsmith wrote:
i may be wrong on 2.4 under driver seat


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now that's sorted, time for western vintage cider Thumbs Up


many thanks for this. is there any documents that explain what the various relays are for. having looked at the wiring diagram above it would appear the compressor / clutch relies on 2 replays (R117 and R181) - but where are they?
Post #637798 16th Jul 2017 1:25pm
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dorsetsmith



Member Since: 30 Oct 2011
Location: South West
Posts: 4554
R181 (C0712) red arrow and R117 (C0019) next one to back of the seat box
Post #637818 16th Jul 2017 3:02pm
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Caterham



Member Since: 06 Nov 2008
Location: Birmingham
Posts: 6298
England 2011 Defender 110 Puma 2.4 XS CSW Stornoway Grey
thanks Dorsetsmith but I'm stumped.....

I tested some of the relays and swapped numerous overall - all relays seem to be fine. No fuses blown for love n money can I find a 12V at the compressor?

I've been disconnecting the two pin plug which is approx. half way between the compressor and injector / head cover. One of the wires being green / yellow.

I've tried with engine running and just ignition on nothing at all. I did wonder if perhaps I'm not finding a suitable earth point but certainly everything I've shows nothing (I'd have at least expected to have seen something if the earth wasn't great?

stumped Question Confused
Post #637854 16th Jul 2017 7:13pm
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Caterham



Member Since: 06 Nov 2008
Location: Birmingham
Posts: 6298
England 2011 Defender 110 Puma 2.4 XS CSW Stornoway Grey
xpertoftheseas wrote:
Check...
Relay R181. Does it close when you press the AC button?

If Yes - It is a compressor/clutch problem.
If No - The ECM is not allowing the clutch to close due to one or more of the following...

1. No pressure in the AC system,
2. Thermostatic switch is faulty
3. Fuse 7P is blown
4. Fuse 14P is blown

1, 3 and 4 can all be eliminated easily. The only thing after these is the thermostatic switch.

Edit.... its here..

Simon,

just read your post again and it would appear I wasn't taking on board what you were saying.....nothing at the / no 12v feed to the compressor suggests 1 or 2 as fuses are ok.

you say 1 is easy to test......how (I presume you're talking a trip to kwik fit or pressing the Schrader valve to see if there's any pressure there?






Let us know how you get on.
Simon
Post #637856 16th Jul 2017 7:19pm
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dorsetsmith



Member Since: 30 Oct 2011
Location: South West
Posts: 4554
work your way down cct with multimeter and test wiring and components, sounds like you open cct in the wiring test one two ways

1. test with multimeter cct live

2. test with multimeter point to point con check

also rid temp 12v DC test the compresses
Post #637933 17th Jul 2017 7:16am
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Caterham



Member Since: 06 Nov 2008
Location: Birmingham
Posts: 6298
England 2011 Defender 110 Puma 2.4 XS CSW Stornoway Grey
/\ how do I test '1' with a multimeter? I've no idea where the switch / sensor would be for confirming there's pressure in the system?

many thanks,
Post #638000 17th Jul 2017 3:01pm
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dorsetsmith



Member Since: 30 Oct 2011
Location: South West
Posts: 4554
you are trying work out failed part of the power cct in the AC compresses control system

http://www.wikihow.com/Use-a-Multimeter
Post #638003 17th Jul 2017 3:13pm
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Caterham



Member Since: 06 Nov 2008
Location: Birmingham
Posts: 6298
England 2011 Defender 110 Puma 2.4 XS CSW Stornoway Grey
sorry Dorsetsmith if this is obvious and I'm missing the point.

I know how to use the multimeter (thanks all the same for the link) but I'm not sure where I need to do the testing. I'll have another look at the diagrams but so far there's nothing getting to the compressor clutch but I've got a feed at the relay.

So I'm guessing I need to find the wires leading to the pressure sensor and bell them out,
find the wires leading to the temp sensor and bell them out and see which is open circuit.?
Post #638008 17th Jul 2017 3:40pm
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