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How to Replace the Thermostat on the Audi A6 1.9 TDI

Model: Audi A6 MK 2, C5 - Years 1997-2004
Part: Thermostat

Today's main instructions will show you the procedure for disassembling and replacing the thermostat on the Audi A6 1.9 TDI. First, open the hood of the vehicle and start disconnecting the coolant hose, allowing the fluid to drain into a container for about ten minutes; then, use a ratchet wrench with an extension to remove and replace the thermostat with the new one, as shown in the video. At this point, install the new thermostat correctly by unscrewing the cap of the coolant reservoir and filling it to the maximum mark!

Updated on 15 September 2026 by ScegliAuto

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