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So, finally... I have working (for now) air con. Don't know how long it will last! Here's a summary of the fix: Fuse socket on top of the battery had bad contacts, meaning problems with the Radiator Fan Control Unit. Repairing the contacts and replacing the control unit has resolved the...

Latest update is that I had a local VAG specialist take a look. They identified that although the fuses on the battery had not blown, the contact at one end has got hot and melted plastic in the vicinity. They cleaned up the contacts. They also swapped my J293 again, for the other of the ones I...

No, it should only spin when the A/C is switched on....

The compressor will run on the auxiliary belt (the one with the alternator on it). Basically if you can look at the various pulleys that the belt goes over, if you see one where the end doesn't seem to be turning, but the belt is going round it, that will be the compressor not running. Will see...

The extra 15bhp did not come with the facelift. I have a facelift 210bhp S3. The main visible difference is the different headlights.

Right... time for another update. I'm hoping this is useful to someone in the future, so I'll keep on posting until I resolve the problem, even though I'm not asking any questions as such. So, replaced the Radiator Fan Control Unit (J293) and there is no change at all :-( I got a local a/c...

Picked up two RFC units from the local scrapyard for £20 the pair - much better than the £108 before VAT that Audi quoted me! Only problem is that these units may be faulty too... hopefully not. Also took a closer look at the pressure relief valve. The manual I've read says that it opens when...

So... haven't had much time to work on the car in the last week, but managed to get time tonight. Since last week and the miraculous recovery of the a/c, it has once again started suffering the electrical problem of the HVAC controller believing the compressor is running. So I've gone back to...

Will take a look. Interestingly I just looked at the diagrams and there is actually a pressure relief valve on the compressor, so I think my original venting was probably through that... although it still remains that I have a leak of some kind somewhere! Will let you know what I find.

Ok, so after I attempted to fiddle with the fan connectors at work on Friday, the a/c worked for the whole of my Friday evening drive to Cardiff.. when I got in the next morning, it was broken again. That's kind of expected, as Staz hinted at above, it's leaking. The difference now is that...

Quick update... It's miraculously started working... I have no idea why!

Have checked a VAG wiring diagram and pins 5 and 14 are indeed connected together, meaning I was testing between a bit of bare wire and a negative, which wasn't a very good test. Unfortunately away at the weekend, so when I return I'll resume the rest of that diagnostics procedure. I did read a...

Ah yes, never actually mentioned... this is an 8L S3, Facelift 2001. Having followed the diagnostics on the RFCU, it got to the point where I was testing the connectors with the engine running and it said to check between A5 and A6 and to expect battery voltage... 0v - it suggests using wiring...

Is there a safety pressure blow-off valve in the system anywhere? When I had it regassed yesterday, it passed the leak test successfully... which suggests the venting was controlled and it's no longer leaking. I've got hold of a diagnostics process for the Radiator Fan Control Unit (which takes...

Basically, yes... Pretty stupid, I know. The compressor clutch is still capable of engaging, but it still doesn't do so automatically. Do you have any recommendations as to what I should check next? You know a lot more about air con than me, so if you've got any helpful hints, that would be great.

Used VCDS to read block 1 of the HVAC Controller. I got a code of 0. Based on the labels below, that means the AC unit thinks that the compressor should be running! Haynes wiring diagram shows that the compressor clutch is fed directly from the Radiator Fan Control Unit... perhaps I need to...

So... having re-read the FAQ again, I've got to the conclusion that the condensor fan not starting may be my problem. I got home after my usual commute and neither of my fans were turning at all, but there was a high pitched noise coming from the back of the fans... all the fuses are fine... so...

So... an update. I wired my compressor direct on the battery in order to test it and it successfully engaged. Tried this with the engine running and I got air con for about 2 minutes... then *pffffffffffft*! A big cloud of rather odd smelling fumes (refrigerant, I assume) out from under the...

I went in to Humphries in Reading (part of Kwik Fit) and they regassed my AC. However, there's another fault which I'm still trying to pin down. So because they didn't get it working, they didn't charge me anything :-)

Hi guys... the other day I stopped getting cold air from my air con. Scanned the HVAC unit for codes with VCDS and it's clean. It will happily claim to switch into and out of ECON mode but the clutch on the compressor does not engage at all, I have watched under the bonnet whilst having someone...