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The Bar Man

Member Since: 22 Jun 2017
Location: Hampshire
Posts: 3

Air Conditioning Problem

Hi,

I'm new here and I'm hoping someone can help me.

The factory fitted air con on my 2007 Defender 90 TDCi has not worked since I bought it last year.

I had the system recharged but that didn't fix the problem and I basically forgot about it until I became motivated by the recent spell of warm weather.

I undertook some basic diagnostics at the weekend with the following results:

1. When I switch the A/C on the button lights up and the fan switches on.
2. The fuse under the dashboard is fine.
3. There is no power getting to the compressor.
4. If I apply power directly to the compressor the clutch seems to engage but there is no cold air.

Based on the above, can anyone suggest what I try next? I was wondering about a possible relay failure but I am unable to identify which of the many relays (under dash and under seat) may relate to the A/C.

Any help would be much appreciated.

Thanks.

26th Jun 2018 3:20pm

dorsetsmith

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

this post show under seat relays

http://www.defender2.net/forum/topic57192....t+fuse+box

wiring diagram for 2.4 a/c system

Click image to enlarge

Click image to enlarge

Last edited by dorsetsmith on 26th Jun 2018 4:01pm. Edited 2 times in total

26th Jun 2018 3:46pm

The Bar Man

Member Since: 22 Jun 2017
Location: Hampshire
Posts: 3

Thanks, that's a great start and this evening's work taken care of.

I'll post an update when I've checked them out.

26th Jun 2018 3:56pm

jst

Member Since: 14 Jan 2008
Location: Taunton
Posts: 7682

2011 Defender 110 Puma 2.4 USW Stornoway Grey

when they filled it did they pressure test it? i would suggest its leaked out and the compressor doesnt run due to this, ie to stop it overheating with no refrigerant in it. Cheers

James
110 XS Utility
130 Puma Station wagon/camper (in the making)
90 Puma Hardtop

26th Jun 2018 5:11pm

The Bar Man

Member Since: 22 Jun 2017
Location: Hampshire
Posts: 3

The garage didn't actually do anything. They told me the refrigerant was fine but I don't know if they tested the level, pressure or both.

26th Jun 2018 5:17pm

jst

Member Since: 14 Jan 2008
Location: Taunton
Posts: 7682

i would get the system pressure tested first before you run up the compressor and potentially kill it in the process. Cheers

James
110 XS Utility
130 Puma Station wagon/camper (in the making)
90 Puma Hardtop

26th Jun 2018 8:59pm

zsd-puma

Member Since: 09 Aug 2016
Location: Kent
Posts: 2720

2010 Defender 110 Puma 2.4 USW Santorini Black

The Bar Man wrote:
The garage didn't actually do anything. They told me the refrigerant was fine but I don't know if they tested the level, pressure or both.

They will have just checked the pressure, the only way to check the level is to vacuum it all out then refill it with the set amount of refrigerant and oil. Take it to Kwikfit and get them to recharge it, if it doesn't work they refund your money. Before they charge it they'll vacuum test it which checks for any leaks, the machine is automatic, if it detects a leak it won't refill it.

From the Kwikfit site;

Quote:
Air-Con
We offer a ‘Recharge or No Charge’ Air-Conditioning Service

You only pay if the coolest vent temperature from your car has improved by more than 10% when measured in degrees Celsius. Please note that if the ambient temperature around the car is less than 9°C it may affect the results of the Air-Con recharge test results. In these circumstances it is at the Manager’s discretion whether to offer a refund. Air-Con repairs are guaranteed for 12 months or 12,000 miles, whichever comes first.

If it doesn't work after it's been refilled, then it could be the pressure switch is faulty. The compressor clutch won't engage if the pressure switch isn't activating it. AC systems are actually pretty basic.

26th Jun 2018 11:52pm

HardCharger

Member Since: 03 Mar 2013
Location: Manila, SFO, Amsterdam
Posts: 673

2011 Defender 110 Puma 2.4 SW Stornoway Grey

If you've checked the relays for the system and it still won't work, check the magnetic coil on the compressor. Sometimes these die and you won't get cold air.

27th Jun 2018 3:27am

zsd-puma

Member Since: 09 Aug 2016
Location: Kent
Posts: 2720

Quote:
check the magnetic coil on the compressor. Sometimes these die and you won't get cold air.

Quote:
4. If I apply power directly to the compressor the clutch seems to engage but there is no cold air.

27th Jun 2018 11:00am

carrotbay

Member Since: 18 Aug 2013
Location: Northants, UK
Posts: 694

2008 Defender 110 BMW M57 3.0 Diesel XS CSW Auto Santorini Black

There are 2 fuses for the air con in the main fuse panel. I had the same problem and it was F42 that had blown. It now keeps blowing

2008 Defender 110 XS SW - M57N2 / 6HP28X

3rd Jun 2019 2:03pm

carrotbay

Member Since: 18 Aug 2013
Location: Northants, UK
Posts: 694

Fixed it .. the wiring loom that comes from the bulkhead along the o/s front wing and to the fan had rubbed through the insulation and was shorting out on the sharp edge of the wing. Fixed the wiring and all fine now for the summer

2008 Defender 110 XS SW - M57N2 / 6HP28X

2nd Jul 2019 7:12pm

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