E30 Zone

For some reason everytime i drive my cab on motorway the coolnt light comes on i check everytime and is full to top? is this just electrical fault or sensor etc...

cheers

Try bridging connectors with a paper clip or something for a couple of days.
It may have a slight airlock which is pulling the water through when on long distance high speed driving?

New sensor £12 from the dealer fixed mine..

Try cleaning the sensor or swap for a new one..