Could still be the thermo fan.
I had one that worked/didn't work intermittently.
Ended up replacing the fan motor. Previous owner also earthed the fan so that it is always on with ignition.
Could also be the sensor on top of thermostat, so if you still have your old one, Chuck it in and see if she works again.
Just my 2c, suspect other more knowledgeable peeps will have s better response.
Cheers!
Temp Sensor Problem
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Re: Temp Sensor Problem
NA6 turbo - 140kw atw - not the most powerful but so much fun 

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Re: Temp Sensor Problem
For info, NA6 B6 has three temp sensors - two at rear of head (for ECU & gauge) & one on top of thermo housing (for fan/s).
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