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Yep, they just left the warranty building! And trying to get out of it.

The leak was there still as that's why it wasn't working in July as the gas had escaped. You 'should' use your aircon for about 30mins every month. You can increase the temp so you're not full cold in the winter.

1. No a leak is only detected by putting a UV dye, so it can be identified where the leak is in the system.
2. No, they are saying there is a leak on the compressor, but don't specify whether it is a joint on the compressor. I seriously doubt it would be a leak on the casing.
3. It is possible to over gas, but the air con machines will show readings and the operator should know what values it should be. But my experience of Audi technicians, is they are liars (As Davide would say) and incompetent. :)
4. Yes you can get a 2nd opinion.
5. there are plenty of places, you would need to state whereabouts you are.

As dealer has acknowledged the fault by attempting repair back in March, this will be recorded and you could argue an unresolved fault since buying the car. If you go armed with the info like unresolved fault and say there is obviously a leak you haven't fixed and mention taking it further (not sure if you bought from an Audi dealer) with Audi UK. The fact that they re gassed it in March proves there was a leak back in March!

Good luck!
 

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So did they put a UV dye in last time? This is the only way they would be able to spot a leak in the system/compressor. My bet is they just regassed it and gave it back to you. A leak will not show on diagnostics as this only reads sensors and components. The only way it will highlight a leak on the diagnostics is by showing a low pressure value in the system. And yes, if they did it properly as a warranty claim, it should have notes on what was done so Arnold Clark get the money back from the warranty company. If you start asking the questions of the UV dye when they re gassed it and for the warranty report, it might put them on the back foot and tell the truth. Air cons can have very small leaks that can't be tested or checked for in a day. What they should have done is put a UV dye in, re gassed and told you to return after a week or 2 as then they can check for leaks with a UV torch as this will show where the leak is if any. If you just had it regassed and you never went back, they could not have checked for tiny leaks, it's impossible to do in a day, unless it is a big leak!

The machine will do a vacuum test on the system to check for leaks, but very small leaks will not be apparent by this method unless you leave it hooked up for possibly days.

Basically they regassed and sent you on your way and because you didn't use it, it just leaked out again from I guess the same 'hole/seal' that is why it wasn't working when you bought it and wasn't working again in July. They didn't fix it, they just refilled it as it's cheaper. Ask them to prove what they 'fixed' back in March and as that would be the reason why it wasn't working when you bought it. If they had fixed it in the summer, you would have been using it and noticed it stopped working not long after they 'fixed it'. just a pity you didn't use it so they are trying to claim, becuase of the time period you have come back again, that it is a separate issue, when it clearly isn't as the problem hasn't been fixed from when you bought the car. I'm sure if you push, as it has been recorded as a fault previously, you can get them to fix it, unless they really are a dodgy company!? :)

I think it would be a big coincidence that they fixed it in March, then the compressor started leaking 4 months later!

I had mine re-gassed recently, just to check the level as it's 8 years old and don't think it's been done before, certainly not whilst I've owned it for the last 3 years, it was definitely working though and they gave me a print out from the machine to say how much it was topped up by in grams.
 
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Ps, another bit of info, all manufacturers by EU law in 2016 had to start using a new gas called R1234YF for environmentally friendly purposes. It used to be R134a.

My step daughter's 2018 Polo's air con stopped working, but it was topped up a few weeks ago and this also uses this newer gas. My bet is it isn't as good as the old stuff and more prone to leaking? I will need to check with her to see if it's still working! I've never had to have a top up done, even going back to a '96 BMW! I only had mine checked as I'm a bit pedantic with my car. :)
 
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You're welcome!
That's the issue with being fobbed off by a garage, they rely on the customer not knowing about cars, so they can fob you off! :)
 
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As a coincidence, as I mentioned my stepdaughter's Polo was regassed 2 weeks ago, this went through vacuum test, passed and then was refilled by the machine. Now it has stopped working again, so there is a leak, that the machine did not pick up on during vacuum test, so that statement from the garage is incorrect!! As I mentioned, the leak has to be big for the machine to detect and not refill!! You can ask an independent air con specialist.

The only way to properly test is to use the dye method and manual UV light test, which takes days to be apparent where the leak is, not a few hours!

If you mention that the machines do not detect leaks lower than a certain percentage loss (which you may need to find out from an air con specialist) and the fact this fault was mentioned and logged as a warranty claim when you had not long since bought the car, plus thro in, you need the paperwork for the small claims court or to return the car, on the basis that it was sold with no faults, they might feel they can help you out. :)

How do they actually know now that it is the compressor, have they done a dye leak test?

I'm going to speak to the garage that re gassed the Polo as I know them well so well I've borrowed tools from them to do jobs on a friend's car, and he offered his ramps for me to use if I needed to work on my own cars! :)

I'll let you know what they say.

You could have a leak thats a more simple or less costly fix and the compressor is the most costly, so are they getting you to pay for this so they make some money!? I would ask for details of how they know it is the compressor leaking, which I doubt! Then if thy do 'replace' it, I would mark it, so you know it has been swapped!

It is a difficult 1, but if you lean on them with what I said above, they may offer a goodwill gesture or even fix it for free as they should have done in the first place!

Good luck.
 
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