Johnny Oxford
Member Since: 14 Dec 2014
Location: Chinnor
Posts: 515
  
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Hi all, is there a thread anywhere with a step by step or list of potential aircon faults and causes?
I know there are a variety of possible causes, but not sure how to try to isolate to which one I have.
All I know is it doesn't work, and it's very hot!!
I have a code reader which shows live values, aircon pressure is 12.51kpa
In hot weather its useless, blows hot air. In marginally warm weather it does seem to try to cool the air a bit, but nothing like it should. 2014 D4 HSE Facelift Corris Grey
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 20th Jun 2017 2:41 pm |
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Bodsy
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If you're not getting a low pressure fault, then it may just be the heater control module. About £75, find it behind the lower glovebox screwed onto the plastic ducting to the right of the blower. Bodsys Brake Bible
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| 20th Jun 2017 2:48 pm |
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Admirable
Member Since: 19 Jul 2015
Location: Fife
Posts: 1011
 
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When was it last re charged?
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| 20th Jun 2017 3:01 pm |
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geoffsnook
Member Since: 13 Jun 2014
Location: south wales
Posts: 3169
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At 12.5 kpa i would say the system is fully gassed so it has no leaks but another issue does the pressure change at all  Discovery 3 se gone
Range rover sport supercharged here:)
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| 20th Jun 2017 3:20 pm |
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Johnny Oxford
Member Since: 14 Dec 2014
Location: Chinnor
Posts: 515
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pressure does not appear to change at all 2014 D4 HSE Facelift Corris Grey
Previous :
Discovery Sport SE (awful)
56 plate D3 HSE TDV6 Zermatt Silver
Defender 90 200tdi
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| 20th Jun 2017 3:28 pm |
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Johnny Oxford
Member Since: 14 Dec 2014
Location: Chinnor
Posts: 515
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Bodsy wrote:If you're not getting a low pressure fault, then it may just be the heater control module. About £75, find it behind the lower glovebox screwed onto the plastic ducting to the right of the blower.
is there any way of testing the blower control module mate? What does it do exactly and are there any faults codes associated with it? 2014 D4 HSE Facelift Corris Grey
Previous :
Discovery Sport SE (awful)
56 plate D3 HSE TDV6 Zermatt Silver
Defender 90 200tdi
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| 20th Jun 2017 3:30 pm |
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Johnny Oxford
Member Since: 14 Dec 2014
Location: Chinnor
Posts: 515
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should have added there is a recurring pressure fault B1B78 system pressure. 2014 D4 HSE Facelift Corris Grey
Previous :
Discovery Sport SE (awful)
56 plate D3 HSE TDV6 Zermatt Silver
Defender 90 200tdi
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| 20th Jun 2017 4:02 pm |
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MikeBob
Member Since: 19 Sep 2016
Location: Pretoria
Posts: 105
 
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12.5 kpa is 0.125bar. way too low...regas the system
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| 20th Jun 2017 4:12 pm |
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Johnny Oxford
Member Since: 14 Dec 2014
Location: Chinnor
Posts: 515
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ok thanks, I thought that might be low. But a post above seemed to suggest otherwise. Is there anywhere obvious to look for leaks before I spend money on regassing? 2014 D4 HSE Facelift Corris Grey
Previous :
Discovery Sport SE (awful)
56 plate D3 HSE TDV6 Zermatt Silver
Defender 90 200tdi
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| 20th Jun 2017 4:36 pm |
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TinTapper
Member Since: 16 Aug 2016
Location: South Northants/Oxfordshire
Posts: 202
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My Aircon's not working either, just connected IID Tool, pressure starts at 625 and runs at about 750 kpa
Anyone know what it's supposed to be and why my interior temp is 35 degrees and not ALOT cooler... 
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| 20th Jun 2017 7:11 pm |
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MikeO
Member Since: 15 Jan 2014
Location: The Cotswolds
Posts: 1372
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"Is there anywhere obvious to look for leaks before I spend money on regassing? '
If you have rear Aircon fitted, the pipes that run along the LH side of the car are notorious for failing. Condensers also go. I bought a cheap UV torch to trace the dye and could quickly see my rear pipes had had it. 2016 Skoda Octavia VRS Estate
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| 20th Jun 2017 7:18 pm |
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geoffsnook
Member Since: 13 Jun 2014
Location: south wales
Posts: 3169
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TinTapper wrote:My Aircon's not working either, just connected IID Tool, pressure starts at 625 and runs at about 750 kpa
Anyone know what it's supposed to be and why my interior temp is 35 degrees and not ALOT cooler...
Mine runs at about that and is really cold but does go over 1000kpa when standing still for a while also the front condensers go quickly i had mine re-gassed twice this year only to find that the Schraeder valve was not sitting right after the first re-gas also replaced the pollen filter Discovery 3 se gone
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| 20th Jun 2017 7:26 pm |
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TinTapper
Member Since: 16 Aug 2016
Location: South Northants/Oxfordshire
Posts: 202
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Hmm, so mine seems to be holding some sort of decent pressure? I do have rear aircon also so will have to check those dreaded rear pipes....
MikeO, are you adding 'dye' to the system? If so where are you putting it in?
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| 20th Jun 2017 8:03 pm |
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geoffsnook
Member Since: 13 Jun 2014
Location: south wales
Posts: 3169
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You add dye the same time you re-gas the same goes for adding oil to lube the rubber washers Discovery 3 se gone
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| 20th Jun 2017 8:06 pm |
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geoffsnook
Member Since: 13 Jun 2014
Location: south wales
Posts: 3169
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Johnny Oxford wrote:should have added there is a recurring pressure fault B1B78 system pressure.
But does it say low or anything after it Discovery 3 se gone
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| 20th Jun 2017 8:08 pm |
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