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Air Conditioning.. Leaks


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#1 pikesrelaybus

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Posted 24 July 2018 - 10:28 PM

Hi Guys,

So, my 140k mile 3.0l 160ps bus has lost it's ability to cool the inside. This hot weather we're having prompted me to take it to ATS who lobbed they're automated system which showed no problems, 2 weeks later and it's stopped again. They told me that they insert a dye for such situations but when I took it back they couldn't find any leaks. The Nitrogen they pressure tested it with has a gauge which dropped slightly over an hour, they said it was such a small leak it was undetectable but I guess this means they have spent enough time on this and don't want to know. Anyway, question is, is there any weak spots I should look for. I'm tempted to get either a IR torch, have a look at night time or simply pressurizer it and go round with a soapy solution from a spray...


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#2 paul.h

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Posted 25 July 2018 - 12:39 PM

It is a UV dye that is put in with the gas so you will need a UV torch to spot the dye. Our C5 was regassed a few weeks ago but within a couple of weeks was not cooling that well so I took it back. They have checked it and found the condenser at the front is leaking so will be fixed next week. They also said the compressor looks a bit damp but that can wait and any leaks from it would be small compared to the condenser. They said they have replaced a lot of condensers so must be a common failure. This is at our Citroen dealer, they may be more expensive than elsewhere but they always do a good job so I can trust them.

 

To find a leak you would need to use the torch and check all the pipes, all the joints, the condenser (this could be prone to being hit by stones with it being at the front), the compressor, the evaporator but this may not be that easy to check due to its location. Doing the check in a darkened area might help. If you use soapy water it might wash off any dye at a leak point so it may be best not to do this.



#3 pikesrelaybus

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Posted 30 July 2018 - 06:45 PM

The dealership said something along those lines, I'm sure they're thorougher but the multiple visits would make it very costly. They refused to look at the air-con due to another issue and then it also needed a service, so that's two more visits, why they can't do it in one visit I'm unsure but it would help me. I guess they can't tie up the workshop so multiple visits is better for them. However, the engine specialist I'm going to on Wednesday to sort out my engine starting problem said it wouldn't be problem. ATS who re-gassed it looked but I guess they didn't want to put too much time into it as they'd not be able to repair it. The chap did say mind, once I get it fixed come back and they'd re-gas it (wink wink), I guess either free or a good discount. My C3's condenser also failed (a long time ago), Because it's aluminum it had got rot in it, soon as it was moved, it simply broke off. I could see the green Dye, very obvious where it had leaked. I note what you say about using soapy water but I was going to pressurize the system and look for bubbles but my first plan of attack is using UV torch.. (or at least, let the specialist have a look!!)


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#4 pikesrelaybus

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Posted 01 August 2018 - 04:35 PM

So, today I went to a Diesel Specialist to sort my starting issue and he had a look at my air-con. They too could not find any leaks with the UV and after 30 minutes his gauge hadn't moved. He injected some oil which will help seal things but also came up with some stuff made by Wurth, "AC leakage stop plus", hopefully that and his oil plus a recharge will sort it out. It was about 6-8 months before I actually did something about my air-con, spurred on by the hot weather. Interestingly, my electronics to control the air-con is fully automatic, I guess you call it climate control. With the system in automatic I remember if you cranked the temperature up the AC pump would stop. I only found this out when it was particularly cold and even on "HI" it wasn't really warming me up. When I dis-engaged the AC pump, which I thought would have turned off anyway, it got a whole lot hotter. It's not a big deal but I don't remember it behaving in this "always on" when I first got the vehicle. It would be interesting if anyone with the same climate control, circa 2008 is able to turn the AC pump on/off simply by turning up the temperature... But, I'm rather hopeful the specialists will sort this out too..


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#5 paul.h

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Posted 02 August 2018 - 01:17 PM

Our 2007 C5 has climate control but I do not use it in auto. I have just checked it and when not in auto, if the temp is set to HI, the compressor still runs all the time if it is set to be activated. I have tried it in Auto and HI but could not really tell if the compressor was switched off - it was 30°C outside though so that may have had an effect. The car handbook does not say if the compressor is stopped in auto if set at HI. If  I remember, when it cools down in a few days I will check it again.






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