I've had an issue with the temp guage ever since I got the car. It is the 2.5tdi... I have changed the temp sensor but wondering if there is anything else I should try. Guage typically doesn't move at all (reads a low temp) very occasionally it seems to rise to 50 to 55 deg C. Would it be possible to test the sensor / guage by dipping the sensor in my coffee with the ignition turned on? I could then see if the guage and sensor are working and move on to working out why the coolant is below temperature (thermostat?) Any help much appreciated.