10th July 2023, 08:44 PM
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Senior Member
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Join Date: Jun 2013
Location: Londonderry, Northern Ireland
Posts: 2,967
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I'd suggest getting some UV dye added to the coolant and checking over the entire engine after its been for a run to see if there is an obvious leak. Looking through some other forums, they mention a few possible options like water pump, oil cooler, EGR cooler and coolant leaks in and around the V of the engine. There is also the following thread on here, with post #2 interesting:
http://forum.a8parts.co.uk/showthread.php?t=15736
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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
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