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D3 - Interior Electrics Airbags, Sensors, climate modules, instrument clusters, switches etc |
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Thread Tools | Display Modes |
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#1
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A/C weird leak
Got an odd issue to pick the collective brains of the forum on - My A/C hasn’t worked for the last 18 months;I went for a recharge and it wouldn’t hold the vacuum so have had a warm cabin ever since.
I have finally got it to my friendly master tech and he’s having difficulty finding the leak! The system completely fails to hold the vacuum at all, no problem he thought, the leak is that bad that it should be pretty easy to hear when he pressurises the system. But no, here’s the oddity, it holds positive pressure. Has anyone else experienced similar symptoms and where did the leak end up being?
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2004 A8 3.0 TDI Sport Brilliant Black Came with: Black Valcona/Alcantara Leather, KESSY, rear blind, flappy paddle gear change, Phone Prep, TV Added:Bluetooth, AMI, Hybrid TV, Parking plus, Ski hatch, towbar, DAB, Umbrella Holder, Reversing camera, Auto lights, Wheel refurb Things to fix: Turbo fault, power drain |
#2
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If he sticks some dye in there it should be easier to find. Can he pressurise it and see if it is still holding in the morning?
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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 |
#3
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Its the compressor
Eventually found the leak by cranking up the pressure to 15bar, turns out the compressor is leaking.
So the next question is whats the difference between the different part numbers? Can I use say a 3.0 petrol compressor in my 3.0TDI? What is the actual difference between a 4e0260895AP and 4e0260895AQ
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2004 A8 3.0 TDI Sport Brilliant Black Came with: Black Valcona/Alcantara Leather, KESSY, rear blind, flappy paddle gear change, Phone Prep, TV Added:Bluetooth, AMI, Hybrid TV, Parking plus, Ski hatch, towbar, DAB, Umbrella Holder, Reversing camera, Auto lights, Wheel refurb Things to fix: Turbo fault, power drain |
#4
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Cannot find the part numbers you referenced, depending on chassis number it should 4E0260805J or 4E0260805BA for 2004 3.0TDI and E or AG for 3L petrol, don't know what is the difference between them.
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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 |
#5
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I couldn't find them either
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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 |
#6
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They are superseded part numbers.
The sequence for the 3.0 tdi ASB is 4e0260805N-AB-AD-AJ-AP and currently BA Its made by Denso and is a 6SEU14C compressor type (6 ribbed 100mm pulley). The AQ model is the same compressor type and pully specs, but is from a 4.0tdi ASE engine. (and has been superseded by the BC variant). So as they are both the same compressor type, oil capacity, pulley specs - what is the actual difference? There are loads of 6SEU14C compressors from all sorts of vehicles, even refurbs for not much money, so would these fit? I'm wondering if the situation with compressors is akin to ride height sensors - the numerous part numbers for these are purely for the different connection arms. The sensor itself is the same across load of model & brands...maybe the bolt on bits are all different but can be transferred?
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2004 A8 3.0 TDI Sport Brilliant Black Came with: Black Valcona/Alcantara Leather, KESSY, rear blind, flappy paddle gear change, Phone Prep, TV Added:Bluetooth, AMI, Hybrid TV, Parking plus, Ski hatch, towbar, DAB, Umbrella Holder, Reversing camera, Auto lights, Wheel refurb Things to fix: Turbo fault, power drain |
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