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Discussion Starter #1
Hi all,

I picked up my used E39 M5 about 4 weeks ago. The aircon seemed weak so I had this regassed.

It passed the automated leak test the regassing machines do and blew icey cold for a day or two. Since then it has been not blowing cold again, I'm not even sure it's engaging.

When I press the max AC button the Auxilliary fan does not come on, although I know the fan is functional as it comes on during/after a spirited drive.

I can therefore only assume my system has a leak that for some reason was not detected when it was regassed.

It was regassed by an independant, so i'm going to take it to a main dealer and get them to try and diagnose the problem. I have a warranty on the car which does cover the AC system (although will not cover things such as corrosion). I'm going to hope the failed part will be covered by this.

Can anyone hazard a guess on what might have failed, given that immediately after a regas it seems to work I am assuming the fundamental mechanicals of the system are sound, and it is most likely something like a hole in the condensor?

I'm not an expert on the subject of AC, but would like half an idea what I'm talking about before speaking to the dealer/warranty company.

Thanks,

Pete
 

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My AC packed up last year and the cause was a shredded belt that should have been driving the compressor.

Worth checking if only to eliminate.
 

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Discussion Starter #3
I've just had all the belts changed, so it isn't that! Given it worked fine immediately after a regas (although packed up again a few days later) I think i'm right in ruling out anything mechanical.
 

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I've just had all the belts changed, so it isn't that! Given it worked fine immediately after a regas (although packed up again a few days later) I think i'm right in ruling out anything mechanical.
That's a pity. It often pays to start simple and it never pays to start complex...

Best of luck.
 

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Most likely to be a very small hole in the condenser (Air con radiator). They should de gas it, put some dye in, re gas it, run it for a while and shine a UV torch around to see where it leaks. Do you have an air con specialist nearby?

While we are at on air con, does anyone know wether it is worth replacing the drier assembly when you get an air con service done? (I am going to get my air con serviced soon - before the hot weather arrives! It, as far as I am aware, involves draining the gas & oil, and refill the gas & oil with new on an auto-cycle programme on the air con machine).
What does the drier assembly do? (It is £110!)
 

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Most likely to be a very small hole in the condenser (Air con radiator). They should de gas it, put some dye in, re gas it, run it for a while and shine a UV torch around to see where it leaks. Do you have an air con specialist nearby?

While we are at on air con, does anyone know wether it is worth replacing the drier assembly when you get an air con service done? (I am going to get my air con serviced soon - before the hot weather arrives! It, as far as I am aware, involves draining the gas & oil, and refill the gas & oil with new on an auto-cycle programme on the air con machine).
What does the drier assembly do? (It is £110!)
Normally you only have to replace the drier if the aircon has been open to atmosphere - basically it absorbs any moisture in the system. I replaced mine cos mine had failed and been open to atmosphere for a long time. Apparently if they are open to atmosphere for a long time the drier can get blocked and will need replacing.

Try an aircon specialist for your leak - most bmw specialists and dealers are not very good with aircon imho. I'd suggest as stated above get them to regas, but with the flourescant/uv dye and check after if it does appear to have leaked.
 
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