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D3 - Interior Electrics Airbags, Sensors, climate modules, instrument clusters, switches etc |
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Thread Tools | Display Modes |
#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 - now gone |
#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 - now gone |
#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 - now gone |
#7
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Very interesting. Where did you get those part numbers as even with the latest updates on ETKA, there are no superseded versions of the compressor on any of the A8 models.
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2001 A8 D2 FL 3.7 Q - LPG Conversion, Engine: AKC, Gearbox:FBB, Colour:LY5X Aqua Blue pearl effect, Interior:WJ light beige/dark beige valcona leather with burr walnut inserts My DIY jobs - Replaced alarm horn, Replaced Coolant Temp sensor, Updated RNS-D firmware, Installed Reversing Camera and Digital TV, Dashcam Installation, Retrofitted Rear Blinds, Auto-Dimming Rear View Mirror, Chrome Boot Struts Sold! 2008 S8 D3 5.2 V10 - Engine: BSM, Gearbox:KLW, Colour:LY7F Suzuka Grey Pearl Effect, Interior:Black/Black with Silver/Black valcona leather with carbon atlas inserts, Bang & Olufsen, Heated windscreen, Soft-close doors, TV, DAB, AMI, Quad Zone, Auto Boot, Auto dim Mirrors, Keyless entry, PDC with rearview camera, AFS II Headlights My DIY jobs - Fan Jet Windscreen Washers, Retrofitted Electric Side Blinds |
#8
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I have ETKA 7.4 on my laptop, though the final update is dated 2014.
After an bit of studying, I have come to a working hypothesis: The compressor itself is standard - ie 6SEU14C, however the ports are modular and bolt on (with the input port forming part of the rear bell housing and housing the control valve) so that they can orientate both ports and valve better for the specific car. Obviously the pulleys are variable to the car and also the control valve (which has different connector options as a minimum). The size of the a/c system determines the oil fill, rather than it being an inherent requirement of the compressor. Soooo - I think if I were to buy a new/refurb then it should be possible to swap out the relevant modular parts - with the downside being loss of guarantee and possibly never sealing again!
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2004 A8 3.0 TDI Sport Brilliant Black - now gone |
#9
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Have you considered getting it refurbished? We have a company local to us that does air con as well as alternators etc
http://www.sacweb.co.uk/airconditioning.html
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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 |
#10
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Quote:
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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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