Member Since: 25 Nov 2017
Location: Lincoln
Posts: 29
Air Con IID Question
Hi All,
After looking through the live values on my IID tool I noticed my air con system pressure is showing as zero, the air con is not particually cold when I put the temp on low, do you know if this this live value is to be trusted? and do you think its indicating a leak in the system?
11th Jan 2018 2:14 pm
Kilovolt
Member Since: 29 Jun 2015
Location: South Derbyshire
Posts: 1020
If it's anything like the air con in my M3 track car, if the pressure drops below x then the compressor will not be allowed to kick in (the magnetic coil clutch will not be energised).
If you switch the A/C on and off can you hear the compressor cutting in and then out etc.
If it does not engage that could be suggestive of low pressure preventing it.
Just a thought."Track day running - Don't put your foot back on the accelerator until your absolutely sure you don't have to take it off again"
Current Ride: D4 XS Commercial Baltic Blue SDV6 fully loaded with heated everything
Track Days: BMW E36 M3 Evolution MY 1996 (3.2 Litre 377 BHP sat in 1,250 Kgs of car, with a pro safety cage and some serious braking power)
11th Jan 2018 2:18 pm
ChrisGT4
Member Since: 25 Nov 2017
Location: Lincoln
Posts: 29
ok thanks, will have another look and listen for the compressor, i'm thinking it may have a leak and needs fixing then re-gassing
11th Jan 2018 2:21 pm
DiscoJeffster
Member Since: 27 Feb 2016
Location: Perth
Posts: 204
I wouldn’t necessarily trust the IID value. Many selectable options exist in software but some are not available across various models as sensors don’t exist etc.
11th Jan 2018 2:52 pm
geoffsnook
Member Since: 13 Jun 2014
Location: south wales
Posts: 3169
That does mean there is no gas in the system so it will not work the condenser on the front is the usual one changed one on my disco and one in my range rover Discovery 3 se gone
Range rover sport supercharged here:)
11th Jan 2018 8:00 pm
geoffsnook
Member Since: 13 Jun 2014
Location: south wales
Posts: 3169
They lose about 10% of gas each year so if it has not be checked for a while it may need to be re-gassed take it to kwick-fit i think they do a £49 check and refill and if it don't work you pay and i have heard some people take it back after a while when the problem is fixed and had it regassed Discovery 3 se gone
Range rover sport supercharged here:)
11th Jan 2018 8:06 pm
kajtzu
Member Since: 11 Aug 2017
Location: Helsinki
Posts: 6575
ChrisGT4 wrote:
ok thanks, will have another look and listen for the compressor, i'm thinking it may have a leak and needs fixing then re-gassing
You should be able to take it for a test and refill. The machine which does it first sucks out the old refrigerant so there is a vacuum, then does a pressure test for 20 minutes or so. Only after that is it refilled. When I got mine done a 1/2 year ago they added some kind of dye which was supposed to make it easier to find eventual leaks.
11th Jan 2018 8:12 pm
lynalldiscovery
Member Since: 22 Dec 2009
Location: Maidstone
Posts: 7274
Its a vac test the machine does, problem is vac does not always find positive pressure leaks, for that you need a nitrogen bottle and a squirty soapy water bottle
11th Jan 2018 8:27 pm
Erea
Member Since: 19 Mar 2012
Location: Munster
Posts: 1509
Re: Air Con IID Question
ChrisGT4 wrote:
Hi All,
After looking through the live values on my IID tool I noticed my air con system pressure is showing as zero, the air con is not particually cold when I put the temp on low, do you know if this this live value is to be trusted? and do you think its indicating a leak in the system?
I must try that setting tomorrow and see what value it shows. mine is an ‘06 so just coming up on 12 years old and I haven’t put gas in it since I got it in 2010. But it’s still as cold as ice when used
11th Jan 2018 8:44 pm
geoffsnook
Member Since: 13 Jun 2014
Location: south wales
Posts: 3169
As lynalldiscovery says you need to have a nitrogen test if you want to find it as a vacuum test will actually seal a small leak so you will never know so either fill it with gas and uv dye and see what happens or get someone to test it with nitrogen Discovery 3 se gone
Range rover sport supercharged here:)
11th Jan 2018 9:18 pm
ChrisGT4
Member Since: 25 Nov 2017
Location: Lincoln
Posts: 29
Thanks for the advice guys, will get it tested and refilled.
11th Jan 2018 10:16 pm
Erea
Member Since: 19 Mar 2012
Location: Munster
Posts: 1509
With the car stopped for about 20 minutes I tested mine and it showed a pressure of 6.1 bar. The air con was very cold on my car The last time I used it.
12th Jan 2018 12:04 pm
MikeBob
Member Since: 19 Sep 2016
Location: Pretoria
Posts: 105
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