A6 3 BiTDi - air con problem

[JimyFloyd]

Hi all,

 

I've got a 2015 A6 as above and the A/C has failed.  I've topped the system up (which claims to have products in to seal leaks) and it's definitely leaking somewhere albeit seems slow.  I replaced the air con pressure switch as it's possibly the easiest thing I've ever replaced on an audi, but no luck.  I have Carista and it's not bringing up any error codes for the A/C system (although there was an odd code in there previously related to ABS???!!!).  I don't have vagcom for this age car (have one for my older audis) and I'm not 100% sure I trust the Carista.  But, saying that, I doubt it would pick up a leak fault anyway.

Has anyone else had this issue that could point me in the direction of what is the likely culprit?  I'm struggling to find any diagrams of this engine layout!

Cheers,

James

[Entwood]

Changing parts willy-nilly is totally pointless and extremely expensive. Take it to an air-con specialist, have some UV dye added to the refridgerant, then the ACTUAL leak can be pinpointed using a UV torch. This will result in just one component, the actual leaking bit, being replaced.

[JimyFloyd]

1 minute ago, Entwood said:

Changing parts willy-nilly is totally pointless and extremely expensive. Take it to an air-con specialist, have some UV dye added to the refridgerant, then the ACTUAL leak can be pinpointed using a UV torch. This will result in just one component, the actual leaking bit, being replaced.

Thanks, but it was a pattern part under £15 so hardly pricey and a lot of people saying this was a potential culprit.  I wanted to see what I could hunt out before taking it somewhere.  Likely I'll send it off to Audi but I'm fairly handy (have fully rebuilt my B5 RS4, which after 20 years still has working A/C!) so I like to try repairing myself.

[JimyFloyd]

One other thing to note is I can't actually hear the clutch engaging i.e. nothing seems to change pressing the AC on/off...whether it's low on pressure or at the right level.