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jrule

Member Since: 10 Aug 2015
Location: Hertfordshire
Posts: 302

TD5 air conditioning wiring

Hi

I am currently retrofitting air conditioning to my MY2000 defender. I have fitted the dash unit and my car has the correct brown 9way multiplug to the fuse box. I am however a bit lost as to how to wire up the condenser fan and the compressor. They each have two way multiplugs which I need to wire in.

Has anyone have experience of the wiring to these units and how I can complete the install. Many thanks in advance I can't seem to reconcile the Land Rover wiring diagram.

1st Jan 2017 2:35pm

dorsetsmith

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

pic missing PC problems

windows 10

Last edited by dorsetsmith on 25th Jun 2019 8:45am. Edited 3 times in total

1st Jan 2017 2:57pm

jrule

Member Since: 10 Aug 2015
Location: Hertfordshire
Posts: 302

Many thanks that's very good of you. Looking at the diagram it appears I need to wire back to relay R181 and R117. Do you have access to any diagrams that show where these are located if not it seems I will need to make up a loom ?

1st Jan 2017 3:37pm

dorsetsmith

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

two relay are located in drive seat box

1st Jan 2017 3:46pm

jrule

Member Since: 10 Aug 2015
Location: Hertfordshire
Posts: 302

Ah excellent I shall have a good look

1st Jan 2017 3:51pm

dorsetsmith

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

https://1drv.ms/i/s!AtZSoWFHDgnGhR4qVgu8b6oQxRlV

1st Jan 2017 3:57pm

Catalou66

Member Since: 24 Jun 2019
Location: Paris
Posts: 2

Hi,
(Sorry for my English because I’m french)
I want also to install an Airco coming from a Defender TD5 99 to my Defender TD5 06 but it looks like the pics you posted has disappeared. May you post them again? I really would appreciate it.

Thanks a lot in advance!

24th Jun 2019 9:50pm

Steve_overland

Member Since: 14 Oct 2018
Location: Gaydon
Posts: 290

1997 Defender 110 300 Tdi HT Chawton White

I can’t see them either... will the diagrams work for 300tdi.. cheers @steve_overland on Insta.
110 expedition vehicle with pop roof

24th Jun 2019 9:56pm

dorsetsmith

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

link to TDI 300 wiring AC too

https://1drv.ms/b/s!AtZSoWFHDgnGjD447hxdHo-gv_oL

Last edited by dorsetsmith on 25th Jun 2019 6:53am. Edited 1 time in total

25th Jun 2019 6:22am

dorsetsmith

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

Catalou66 wrote:
Hi,
(Sorry for my English because I’m french)
I want also to install an Airco coming from a Defender TD5 99 to my Defender TD5 06 but it looks like the pics you posted has disappeared. May you post them again? I really would appreciate it.

Thanks a lot in advance!

Ac fuse are different places between TD5 99 and TD5 06 main loom as the centre fuse box changed post 02 face lift

will re post then

Last edited by dorsetsmith on 25th Jun 2019 7:22am. Edited 1 time in total

25th Jun 2019 6:29am

dorsetsmith

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

Click image to enlarge

Click image to enlarge

MY 1999 to 2000

Last edited by dorsetsmith on 25th Jun 2019 8:43am. Edited 1 time in total

25th Jun 2019 6:55am

Martin
Site Admin

Member Since: 02 Apr 2007
Location: Hook Norton
Posts: 6611

2015 Defender 90 Puma 2.2 XS CSW Montalcino Red

Td5 and 300 Tdi in here (2002MY):

https://www.defender2.net/gallery/albums/u...IONING.pdf

1988 90 Td5 NAS soft top

2015 D90 XS SW

25th Jun 2019 8:04am

Catalou66

Member Since: 24 Jun 2019
Location: Paris
Posts: 2

Thanx a lot!

25th Jun 2019 3:08pm

MYSTERY

Member Since: 14 Jun 2019
Location: Torquay
Posts: 10

ONE SHEET

Click image to enlarge

28th Jul 2019 8:44pm

achuakh

Member Since: 12 Apr 2012
Location: Singapore
Posts: 158

technically, you don't need to get the AC unit to talk to the ECU.

Pro:
When it's wired to the ECU, the ECU can control when to "request AC clutch" and when to "request AC fan".
When the driver turns on the AC, he "request AC" to the ecu via the 12v AC request at high.

The ECU then checks the operating conditions like engine temperature and engine rpm. If the temperature is ok and the engine is not labouring, the ecu will then "request AC clutch" and then "request AC fan". If the engine temperature is high, the ECU can also use the "request AC fan" to aid cooling If the engine rpm is high, then it will not immediately "request AC clutch"

When "AC clutch request" is made, depending on the RPM, there's a table in the ECU map to inject more fuel and it tapers down around 4000rpm.

Con:
Let's not complicate the install as you will need to mess around with the ECU pins and such to get those to close the correct relay.

If using a manual AC unit, when the AC clutch and fan are on, the ECU will already know how to compensate for the drop in RPM when idling so there's no adjustment to do.

Having a separate AC system from the ECU is easier to isolate if something goes wrong. From the land of the most expensive land rover defenders on planet earth. At �125k for a XS 110 csw and you get to own it only for 10yrs! Please find me a good reason to stay on this island.

29th Jul 2019 12:27pm

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