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#1
22nd October 2022, 09:05 AM
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Common air con fault?
Is there a common air con fault in the D3 cars?
A few years ago I changed the pressure sensor - to no avail. I didn’t code it as I guess it’s just plug and play. The part I used was not genuine audi - it was a euro car parts - but given the nature of how it works, I thought any brand would be ok. Is there a common issue with the condenser? I’ve lived without aircon for a while, but, it’s not ideal. Is there a ‘flow chart’ handy for checking air con faults? Cheers.
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Current: Graphite grey 2016 q7 3.0 (4m) Night blue - 2005 D3 4.2 TDi LWB My pride and joy - 1991 ur 20v quattro (owned since 2003). BMW 645 (Need to sell now I have 2 A8s....) Previous cars A8 D4 4.2tdi lwb (2011) A4 cab 3.0 Quattro petrol (2005) T5 Caravelle exec 2.5 (2006) A8 D2 3.7 quattro sport (2001) A8 D3 4.2 quattro (2003) A6 4.2 quattro avant (1999) A6 2.8 quattro (1998) Audi Coupe 2.6E (1993) Carlton 3.0 GSI 
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#2
22nd October 2022, 11:12 AM
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Well the pressure sensor is a comment n fault not just D3 but they n general for VAG cars. If you have VCDS or similar you can go and check in measuring blocks, if it shows abnormally high pressure then the sensor is faulty. Another common fault for any car is leak either major or slow leak. When the pressure drops below certain level it will stop working. I notice it has not been running for a while which is never good. If there is major leak it will mean air and moisture could be getting it filling up dryer or causing corrosion resistant inside. Even if there is no leak and it has sufficient pressure not using could mean less oil and additive circulation in the system, not conditioning rubber seals, them drying out, developing micro cracks and starting a slow leak. This is more likely on older cars with clutched compressor meaning if Aircon is off there is not refrigerant circulation, less likely on D3 with permanently driven compressor. Don't think there is common fault on D3 with condenser but there can always be exception with it getting damaged or getting corroded from road salt.
First call would be check pressure with VCDS, if it shows very high pressure change pressure sensor, if it shows low pressure take it to Aircon specialist to investigate for leaks
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Currently 8less 2011 Q7 S Line 3.0TDI, 2016 Tesla Model S 90D 8 history: 2006 A8 Sport 4.2TDI quattro SOLD, 1997 S8, reached end of life with gearbox failure
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#3
23rd October 2022, 09:11 AM
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I changed mine a few years back, no need to code anything, although I did go for a genuine one (new/old stock on ebay). Never had an issue since.
As said, check with VCDS and if no joy, take it to an air con specialist who can pressure test the system. They can inject a UV dye which can then be detected to find the leak.
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2008 (facelift) S8 with B&O, ACC, glass sunroof, reversing camera, front and rear heated seats, ceramic brakes, homelink, electric side and rear blinds, ski load through, heated fan washer jets, remote boot closing, de-flapped manifold, fridge, umbrella holder 
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#4
23rd October 2022, 11:30 AM
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Ok. I’ll plug in and see. Thanks
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Current: Graphite grey 2016 q7 3.0 (4m) Night blue - 2005 D3 4.2 TDi LWB My pride and joy - 1991 ur 20v quattro (owned since 2003). BMW 645 (Need to sell now I have 2 A8s....) Previous cars A8 D4 4.2tdi lwb (2011) A4 cab 3.0 Quattro petrol (2005) T5 Caravelle exec 2.5 (2006) A8 D2 3.7 quattro sport (2001) A8 D3 4.2 quattro (2003) A6 4.2 quattro avant (1999) A6 2.8 quattro (1998) Audi Coupe 2.6E (1993) Carlton 3.0 GSI
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