A3 Tdi temperature gauge

[rfisher]

My 2001 A3 reads 75oC when fully warmed up.

It's had 3 thermostats (85oC opening) and a new sender but is still bust.

Anyone know if there's an earth for the gauge on the dash somewhere that may be making a poor contact?

[rfisher]

Right.

Further testing has shown that;

1. The gauge is working properly and showing the correct water temperature.
2. The thermostat is working properly and opening at 85oC.
3. The engine is running cool at around 75oC.

There's clearly a leak of cooler water entering the recirculating water circuit before the thermostat is opening.

I reckon this is around the water pump somewhere.

Anyone know if this happens with this engine?