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Discussion Starter · #1 ·
Hello,

Have a problem with the air con on my 2004 A3 1.9tdi.

The clutch wont engage on the compressor although the system is gassed
and the 12v is seen on the connector to the compressor when you operate
the air con switch on the dash. Hit econ and it switches the 12v off,
so from this i am thinking that all is well with the gas and pressure.

Not too hot on these compressors but am i correct in thinking that if i
simply connect 12v to the compressor then i should hear the clutch work
on it?

Had the compressor off its mounts and its fairly new think there is a
date mark of sept 2008 on it. Its a Hella item also code number is:

8FK 351 316-141

Any help much appretiated.

Cheers

Mark
 

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Discussion Starter · #2 ·
I have read that there is a pressure switch that is on the compressor so maybe this is faulty. Anyone had any experience of them?
 

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Dont think the pressure switch is on the compressor its normally screwed into one of the pipes mate
 

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Discussion Starter · #4 ·
So if the pressure switch was faulty then it would simply kill the 12v feed to the compressor. Since I have the 12v then do you reckon its safe to assume this is all ok and that the fault is with the compressor? Have seen that the electrical connection can be removed from the compressor so was just wanting to find out if this could be the fault? Not sure why the connection is able to come off this was my reason for thinking it may have been some sort of pressure switch.

Thanks for your thoughts much appreciated.
 

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I should imagine it would yeah as on modern cars when even such as the aircon gas been low the aircon will not even try to switch on,how do you know its gassed? as even when they are low it seems when you press the release on the valve the is a big out burst of pressue,thanks for comments on the car mate get some of yours up
 

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Discussion Starter · #8 ·
I am away up just outside Aberdeen.

To be honest i have simply done like you suggest and pressed the valve bad bugger i know.... My thoughts are that if the gas was low then i would not get the 12v at the compressor so this is why im thinking its the compressor clutch. If the system was low then there would not be 12v being fed to the compressor i would think this would be the first voltage it would cut out. Might take it along to kwik fit and get them to test, dont think it costs anything if they cant get it to work.

Yeh thats the colour i really like in the A3 dolphin grey is it? Nice alloys also, which ones are they if you dont mind me asking. Dont have any pics of mine yet but its a 3 door in silver. Standard alloys which is hopefully going to change fairly soon.
 

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Yeah it is dolphin grey and the alloys are just the standard 18's,to be honest mate kwik-fit etc are only good for if its empty and pretty poor with diagnostics,there is a good place in sheffield but i didnt know if you lived a bit nearer,but there should be a closer by specialist
 

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Discussion Starter · #10 ·
Well think its narrowed down to the compressor so will try and get hold of a second hand unit. Firstly try and pull the clutch from it and see if i can swap over.
 

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mpgscott

Sorry to jump on an OLD post but I recently bought a 57 plate A3 3.2 which is pretty much running like a dream apart from the air con is not working properly - pumping out warm air even at the lowest temp setting. Googled the problem, which seems to be pretty common, and this post came up.

I'm not very tech minded but I initially thought it may just need re-gassed but starting to wonder if there is more to the problem having read various forums.

Does anyone have any advice re getting it fixed without a huge dealership bill as I believe changing compressors etc can be pretty expensive?? Appreciate any advice anyone has for the best way to diagnose the problem while bearing in mind my knowledge is limited

Cheers
 

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Discussion Starter · #13 ·
Just take your car round to any Kwik Fit (i know what folk will say)
but they will do a re-charge for £49.99 and if it doesnt work then you
dont get charged so nothing to loose really. I have had a couple of
cars re-charged now and found them to be brilliant and air con still
working fine on the Audi after a re-charge last year after fitting
another compressor.

So i would pop round and give it a try, out of interest whats the mileage on the car?

Cheers

Mark
 

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siezed compressor i had it happen to my golf and got a second hand working one for £15 off ebay half hour to fit.

id put money on it being that
 

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Cheers guys appreciate the quick responses.<o:p></o:p>

The car has only done 29.5k so I was sort of hoping that I wouldn't have any problems but that's cars for you!!<o:p></o:p>

Mark, I will prob take your advice and go to Kwik Fit initially, like you say no harm in it if they don't charge if it doesn't work, however knowing my luck it will probably be something more expensive! Will post again once I've done that.<o:p></o:p>

Adz, cheers for the input, do you know what spec compressor I would need if the re-charge doesn't work? Thing is I would also need someone to fit it as well....what would a garages stance be on fitting a second hand one?<o:p></o:p>

Apologies for another long winded post!<o:p></o:p>

Graham<o:p></o:p>
 

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Discussion Starter · #16 ·
Hopefully this will tell you, its a 4 cylinder engine isnt it in the S3?



This should give you the number, i bought my compressor off ebay and its been working fine for around a year. Flippen expensive if you buy new around £350 i think i paid around £60 for mine. Easy to fit but you are supposed to get the system emptied first, if you goto kwik fit and its not fixed with a re-gas ask them to empty the system at the end if they cant fix it then change the compressor yourself. Its easy enought to do.
 

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No it's the 6 cylinder 3.2 engine I have, couldn't quite stretch to the S3 unfortunately!

I was hearing stories of bills coming in around £800 to fix this problem at Audi dealers so was obv hoping that I could do it with a second hand part - if it is the compressor.

Thanks for the advice I will hopefully get past Kwik Fit on Friday and if the re-charge doesn't work then I will get myself onto ebay.

Take it you found the compressor easy enough to change?

Thanks again.
 

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Discussion Starter · #19 ·
Yep its easy enough to change, think the compressor for the 6cylinder is part no: 1K0820803G and 1K0820803F so its the same item (they never change much) so should be easy enough to find one.

Good luck hopefully its simply a re-gas.
 
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