Sensor fault?

[RichardBaronGolf]

Hi all, been having a bit of a strange problem with my mk3 abf, it's happened three times now ill be driving the car. And the temperature warning light starts flashing every time it happens the water and oil temperature and normal and there's no sign of any actual overheating ? Is at this just a sensor fault if so what sensor? Just to confirm I'm not being stupid the warning light that comes on is the one on the very left where the lights like the handbrake and oil warning lights are etc. that is temperature ? Thank you  

[itavaltalainen]

if the temp display in the cockpit is ok then it would not be the temp sender (well not the sensor that is responsible for the temp display). more likely to be the coolant level sensor in the expansion tank. if its electrodes get too dirty it may not sense coolant and this is reported through the same light as over temp.

try cleaning the contacts with an old toothbrush - if that does not work fill slightly over max, that sometimes does the trick. if still no luck replace expansion tank with sensor.

[RichardBaronGolf]

Just let everyone know, Cleaned the sensor as suggested and problem solved. Thanks everyone