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Author Topic: Help diagnose my air con  (Read 3204 times)

Offline white91

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Help diagnose my air con
« on: July 23, 2015, 11:58:14 pm »
Hi could do with a little help with my air con.

Bought my 2005 GTI with it not working, noticed there wasn't any gas in it, today I regassed it, the system held pressure and no leaks were present.

It still doesn't work! VCDS shows no faults, apart from low pressure due to no gas in it. Now cleared.

What next, pressure switch or compressor? How do I diagnose?
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Offline Matthewsimone

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Re: Help diagnose my air con
« Reply #1 on: July 24, 2015, 06:52:48 am »
Mine was faulty pressure switch diagnosed by my air con specialist friend
Mine still had plenty of gas in there though so its strange that yours was empty!

Pressure switch was about £35
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Offline OEM+ DUB

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Re: Help diagnose my air con
« Reply #2 on: July 24, 2015, 11:25:00 am »
When you say it still doesn't work, is that because you are not getting cold air in the cabin?

Aside from the pressure switch, I would also check that when switched on the aircon makes the small fan (of the two on the radiator) turn.  If not, then with the engine off try turning the fan by hand.  If it won't turn it is seized and needs replacing.  If it will turn then try checking the relevant fuse, etc. or take out the fans and open up the small one to see if one of the carbon brushes has stuck open.  If so, free off, clean, reassemble and see if that helps.  If the small fan isn't turning then the system can't cool the refrigerant which leads to no cool air.

Hope this helps.
« Last Edit: July 24, 2015, 02:25:24 pm by OEM+ DUB »
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Offline white91

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Re: Help diagnose my air con
« Reply #3 on: July 24, 2015, 11:42:49 am »
This might be something my mate mentioned, cheers I will have a look when I get chance
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Offline white91

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Re: Help diagnose my air con
« Reply #4 on: July 24, 2015, 01:02:48 pm »
Right had a look under the bonnet, no fans are running with or without the air con on. With the engine off both fans spin freely. Clearly an issue here
« Last Edit: July 24, 2015, 01:25:57 pm by white91 »
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Offline Matthewsimone

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Re: Help diagnose my air con
« Reply #5 on: July 24, 2015, 01:24:38 pm »
Could well be a faulty pressure switch then mate or worse case scenario the clutch on compressor is fooked
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Offline OEM+ DUB

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Re: Help diagnose my air con
« Reply #6 on: July 24, 2015, 03:03:06 pm »
Main thing is not to panic and to start off by checking/ruling out all the easy to check items such as fuses, control units, etc.  Also, the small fan is supplied with power via the large fan so it might be a fault with that...
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Offline white91

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Re: Help diagnose my air con
« Reply #7 on: July 24, 2015, 05:02:07 pm »
Cheers I guess I can test the fans via VCDS? Could even be a fuse!
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Offline AliGTI

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Re: Help diagnose my air con
« Reply #8 on: July 24, 2015, 09:54:27 pm »
I just had a new compressor fitted and the system regassed for the painful price of £637.  :( This was from a AC specialist and not WV. The money VW wanted was eye watering!! :(
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Offline Matthewsimone

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Re: Help diagnose my air con
« Reply #9 on: July 24, 2015, 10:04:50 pm »
Quote from: AliGTI on July 24, 2015, 09:54:27 pm
I just had a new compressor fitted and the system regassed for the painful price of £637.  :( This was from a AC specialist and not WV. The money VW wanted was eye watering!! :(

Unfortunately thats double what I was quoted by local Aircon specialist friend
He also told me they are very easy to refurbish if you know what your doing  :happy2:

Not my local specialist but plenty about
http://pages.ebay.com/link/?nav=item.view&alt=web&id=252015835161&globalID=EBAY-GB
« Last Edit: July 24, 2015, 10:11:18 pm by Matthewsimone »
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Offline white91

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Re: Help diagnose my air con
« Reply #10 on: August 11, 2015, 05:37:47 pm »
Quick update, I've tested the fans, they both spin when powered so seem to be working fine. I've ordered a high pressure switch, this might cure it? Do they have a seal of o ring to replace too?

Finally I've read somewhere this is the bit of the compressor that fails? http://pages.ebay.com/link/?nav=item.view&alt=web&id=271364312251&globalID=EBAY-GB


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Offline white91

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Re: Help diagnose my air con
« Reply #11 on: August 16, 2015, 06:25:07 pm »
Another update, wasted my money on a switch as it still doesn't work!

How do I diagnose a compressor?


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Offline white91

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Re: Help diagnose my air con
« Reply #12 on: August 16, 2015, 06:27:15 pm »
No gas either after I was told it held a vacuum! Back tomorrow for a re gas then


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Offline jimmy-s3

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Re: Help diagnose my air con
« Reply #13 on: August 17, 2015, 07:14:08 am »
Mine wasn't working....
I had it regassed, still didn't work... Changed the pressure switch and the little o-ring.... Still didn't work...had it re-gassed again and finally it works!
What I have noticed with mine is that there is a small leak of fluid coming from where the aircon pipe connects to the aircon radiator... I only noticed this when I took the bumper off last week to have painted. I noticed oily fluid that had dripped onto the intercooler pipe, and traced it back to the aircon pipe work. I think this is why my aircon packed in in the first place...???
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