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Author Topic: Noise when air con is on  (Read 4920 times)

Offline Human Joist

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Noise when air con is on
« on: November 30, 2013, 02:51:44 pm »
Daft one this. But I noticed today a strange noise. If I have the engine running and fans to low with the air con off its fine. If I then turn on the air con I can hear what I would describe as a dry bearing noise from in the dash. I know you can hear the air con work as the engine tone changes and I hear the pump start to work. It's just this noise is new. Any suggestions welcome

Offline doylebros

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Re: Noise when air con is on
« Reply #1 on: November 30, 2013, 04:52:11 pm »
If it sounds like Darth Vader breathing this would be my first thoughtS:-

Has it be recharged with gas lately, if not a recharge and replace the pressure (switch failure is common).

After that I would be looking at a compressor as they also have a history of failure around 70k mark.

Finally, it not uncommon for these faults not to show up when scanned with VCDS.

If you do a search for pressure switch or aircon you'll be able to find similar threads on this topic. :happy2:

Offline Human Joist

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Re: Noise when air con is on
« Reply #2 on: November 30, 2013, 06:12:21 pm »
Ok the air con did work in the summer. If the switch fails would it cause the noise as above. Otherwise I will have to wait for summer to discover if it works ok as I can tell the comp kicks in but as it's cold can't tell if it's gassed or not

Offline doylebros

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Re: Noise when air con is on
« Reply #3 on: November 30, 2013, 07:35:48 pm »
The switch failing will cause the noise I mentioned, just before it looses all the gas - then the noise stops but the aircon won't work.

For 2005-08 Vehicle with aircon

Typically aircon service including regard £45.00

Switch part no - 1K0 959 126 E (G65) £60.77

Seal part no -8E0 260 749 £0.76

Both items full retail inc vat.

Offline Human Joist

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Re: Noise when air con is on
« Reply #4 on: November 30, 2013, 08:01:29 pm »
Nice one. Will order switch now then re gas at some point as I understand it can be changed without a re gas. Cheers.

Offline SRC

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Re: Noise when air con is on
« Reply #5 on: December 01, 2013, 11:02:04 am »
Darth Vader is exactly the description I used - and it was the pressure switch at fault.



Shadow blue DSG 5 door with leather, sunroof, 18" Monzas, MFSW. 
Full list of mods:  Seat inserts and a VW bottle opener.  Each worth 20bhp.

Offline Human Joist

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Re: Noise when air con is on
« Reply #6 on: December 01, 2013, 02:54:40 pm »
Will call VW tomorrow and get a price

Offline Human Joist

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Re: Noise when air con is on
« Reply #7 on: December 30, 2013, 01:01:15 am »
Not got chance to do this yet. The noise has now stopped and now when I switch the air con on I can't hear the compressor kick in. I take it this will further diagnose the fault to be the switch.

Offline doylebros

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Re: Noise when air con is on
« Reply #8 on: December 30, 2013, 07:21:37 pm »
That's how mine failed many months ago - new switch, re-gas and now all working as it should.

Offline Human Joist

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Re: Noise when air con is on
« Reply #9 on: December 30, 2013, 09:33:57 pm »
Good good. Sounds promising