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4RF RDS

Member Since: 19 Jul 2015
Location: Ottawa
Posts: 950

2000 Defender 110 Td5 XS CSW Epsom Green

AC stopped working

Any AC experts on here who may be able to assist??

My AC stopped working in the spring, had the system drained, tested and refilled (first time in 10 years and it was only slightly low). No leaks identified.

Worked fine all summer. Stopped working again in September. Nanocom can trigger the compressor and its not seized. Fan works fine as well via Nanocom and 12V directly. AC blower works as it should. Disassembled both switches and cleaned them then reassembled and still no joy.

Finally decided to have my LR indie garage specialist have at her. My mechanic suggested we try the receiver dried after the refill machine identified the system was contaminated. Changed receiver drier, refilled properly, still not working. Wiring diagrams do not match my VIN according to Topix and the electrical library does not have values to measure for input measurements on switches, trinary switch etc. Decided to change the Trinary switch, still not working. Temp sensor to AC module in the evap is working according to their tests. AC control module was switched out with a spare and its still not working. Simoly cannot get the compressor to trigger and start cooling

Any ideas where to go from here?

Thanks for reading… 2010 Range Rover MkIII Autobiography Super Charged (Idris)
2003 Range Rover Mk III (Desmond FitzWilliam)
2000 Defender 110 CSW TD5 (CTX)
1992 Range Rover Classic (Lizzy)
1972 Series III 300 Tdi (Stanwood)
1967 MGB GT

Every normal man must be tempted at times to spit on his hands, hoist the black flag, and begin to slit throats.
H. L. Mencken (1880 - 1956)

12th Nov 2024 5:38pm

bankz5152

Member Since: 02 Feb 2017
Location: South London/North Kent
Posts: 2187

I would be shocked if you condenser is still functioning correctly. Id replace that, regas and go from there. Instagram @defender_ventures
Empire Tuning - Agent

12th Nov 2024 6:50pm

4RF RDS

Member Since: 19 Jul 2015
Location: Ottawa
Posts: 950

Really?!? Hmmm, that’d be a new one on me! Never seen one fail being completely intact and in good shape.

Thanks 2010 Range Rover MkIII Autobiography Super Charged (Idris)
2003 Range Rover Mk III (Desmond FitzWilliam)
2000 Defender 110 CSW TD5 (CTX)
1992 Range Rover Classic (Lizzy)
1972 Series III 300 Tdi (Stanwood)
1967 MGB GT

Every normal man must be tempted at times to spit on his hands, hoist the black flag, and begin to slit throats.
H. L. Mencken (1880 - 1956)

12th Nov 2024 7:42pm

bankz5152

Member Since: 02 Feb 2017
Location: South London/North Kent
Posts: 2187

Mine was brand new LR one, new seals. It leaked out every 6 months, gas would only last the summer.

They may appear to be in good condition but often arnt Instagram @defender_ventures
Empire Tuning - Agent

12th Nov 2024 7:50pm

4RF RDS

Member Since: 19 Jul 2015
Location: Ottawa
Posts: 950

No leaks now, but could it be blocked internally?? 2010 Range Rover MkIII Autobiography Super Charged (Idris)
2003 Range Rover Mk III (Desmond FitzWilliam)
2000 Defender 110 CSW TD5 (CTX)
1992 Range Rover Classic (Lizzy)
1972 Series III 300 Tdi (Stanwood)
1967 MGB GT

Every normal man must be tempted at times to spit on his hands, hoist the black flag, and begin to slit throats.
H. L. Mencken (1880 - 1956)

12th Nov 2024 8:04pm

blackwolf

Member Since: 03 Nov 2009
Location: South West England
Posts: 17501

2007 Defender 110 Puma 2.4 DCPU Stornoway Grey

What pressures are you getting in the HP and LP lines with the compressor running and with it not running?

12th Nov 2024 10:46pm

4RF RDS

Member Since: 19 Jul 2015
Location: Ottawa
Posts: 950

I don’t have those values. The compressor won’t engage… I’ll see if my guy has them recorded for not running and report back.

Thanks 2010 Range Rover MkIII Autobiography Super Charged (Idris)
2003 Range Rover Mk III (Desmond FitzWilliam)
2000 Defender 110 CSW TD5 (CTX)
1992 Range Rover Classic (Lizzy)
1972 Series III 300 Tdi (Stanwood)
1967 MGB GT

Every normal man must be tempted at times to spit on his hands, hoist the black flag, and begin to slit throats.
H. L. Mencken (1880 - 1956)

13th Nov 2024 2:43am

blackwolf

Member Since: 03 Nov 2009
Location: South West England
Posts: 17501

Ah, OK, I missed that bit in your original post.

So compressor works from Nanocom but not autonomously. Suggests that one or more of the switches involved is haywire. Let me ponder about this for a bit to see if I can come up with any ideas.....

Curiously my TD5 Disco2 has been exhibiting odd A/C symptoms as well, but I am not sure how similar the two are. I have more or less understood how the Disco2 is supposed to work.

13th Nov 2024 7:55am

TexasRover

Member Since: 24 Nov 2022
Location: Paris
Posts: 1101

2002 Defender 110 Td5 DCPU Chawton White

Sounds like more of any electric issue. So its a 2000 and should therefor have the 'add on' AC module at your knees. The wiring diagram for that is easily attainable.

Unlike a really simple system there is an electronic thermostat through the controller and the engine ECU has some control over the Compressor and Fan too. Its a pretty simple system and you need to chase back the power supply check the relay functions and wire continuity. It could be the controller but most likely there is a relay or power supply fault.

13th Nov 2024 9:11am

4RF RDS

Member Since: 19 Jul 2015
Location: Ottawa
Posts: 950

So I am able to make The AC run by bridging the relay wires with the relay removed. The wiring works as does the relay but the switches do nothing when the relay is put back in place. The blower works fine and the fan works as does the compressor when I bridge the wires. I’ve traced the wiring in the switch loom to the blower and temperature control switch and all is good.

If I can make it work by bridging the relay wires I suspect that it is not getting a signal from the engine and or trinary switch🤷‍♂️. Anyway anyone have any other ideas where to check?

Thanks [/quote] 2010 Range Rover MkIII Autobiography Super Charged (Idris)
2003 Range Rover Mk III (Desmond FitzWilliam)
2000 Defender 110 CSW TD5 (CTX)
1992 Range Rover Classic (Lizzy)
1972 Series III 300 Tdi (Stanwood)
1967 MGB GT

Every normal man must be tempted at times to spit on his hands, hoist the black flag, and begin to slit throats.
H. L. Mencken (1880 - 1956)

27th Nov 2024 5:02pm

PoormansXS

Member Since: 21 Oct 2023
Location: Lincolnshire
Posts: 55

2002 Defender 90 Td5 CSW Buckingham Blue

Are you still having trouble with this? I just kind of skimed over it at work but I have a cool air Logan manual somewhere that I think tells you how to connect the under dash unit bypassing the ECU control. Let me know, I installed the system in my 90 so got to know it quite well

11th Jan 2025 2:31pm

4RF RDS

Member Since: 19 Jul 2015
Location: Ottawa
Posts: 950

Indeed I am still unable to make it work as it should. Any further assistance would be welcomed. Thank you. 2010 Range Rover MkIII Autobiography Super Charged (Idris)
2003 Range Rover Mk III (Desmond FitzWilliam)
2000 Defender 110 CSW TD5 (CTX)
1992 Range Rover Classic (Lizzy)
1972 Series III 300 Tdi (Stanwood)
1967 MGB GT

Every normal man must be tempted at times to spit on his hands, hoist the black flag, and begin to slit throats.
H. L. Mencken (1880 - 1956)

11th Jan 2025 4:48pm

PoormansXS

Member Since: 21 Oct 2023
Location: Lincolnshire
Posts: 55

Firstly- I’m not an automotive electrician I’m a factory engineer so anyone feel free to jump in and help out if anything I’m saying doesn’t look right.

The fact that you’re able to trigger the compressor via nanocom obviously means everything from the ecu output is healthy so either

- ECU conditions for compressor to kick in aren’t being met
Or
-the compressor request signal from the underdash unit is not reaching the ECU

Firstly I would check voltage to connector c0658 pin 23 on the ecu with the air con switch in position 4 (max cold) and position zero. With the engine and blower running (purple wire with black line in middle on picture) if you see voltage go on/off then your dash unit is sending the run request to the ECU.

Feel free to PM me and when I’m free I can do some testing on mine if needed.

Click image to enlarge

11th Jan 2025 7:22pm

4RF RDS

Member Since: 19 Jul 2015
Location: Ottawa
Posts: 950

Excellent thanks for the help. 2010 Range Rover MkIII Autobiography Super Charged (Idris)
2003 Range Rover Mk III (Desmond FitzWilliam)
2000 Defender 110 CSW TD5 (CTX)
1992 Range Rover Classic (Lizzy)
1972 Series III 300 Tdi (Stanwood)
1967 MGB GT

Every normal man must be tempted at times to spit on his hands, hoist the black flag, and begin to slit throats.
H. L. Mencken (1880 - 1956)

11th Jan 2025 7:51pm

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