Temp gauge issue A3 2.0 Tdi

YorkshireAudiA3

Audi A3 2.0 Tdi Sport
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Apr 21, 2015
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Bradford, West Yorkshire
Hi guys,

I have a really frustrating problem with my A3 2.0 Tdi 2004 plate.

The temp gauge will warm up as normal (seems to take a while to get up to 90C) but then it will fall to zero, then 1/4 then back up to 90 and hold there for a while, and then fall to 1/4...repeats.

I've had the Temp sensor replaced and ECU cleared of faults. Anyone any ideas? I'm thinking thermostat or wiring issue after a google search?

Just had a new radiator fitted/coolant flushed etc due to it leaking so no issues there. The fault was also present before the radiator was changed anyway.

Thanks
 
I believe there are two temp sensors, and a thermostat.
 

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