Radiator Dash Light
 

94 W140
The other morning shortly after I left may gararge the Radiator warning light lit up on the dash for about a minute and then went out. The temp was normal and it came on again for a few seconds and I proceeded onto the highway the car drove fine normal temp and the light didn't come on again. At work I check and the resevoir was full. I checked the next morning and it was ok. There are no leaks and my car runs fine.
What could be causing this?

air in the system perhaps? Have you had the cooling system open recently? Or it could be just a bad sensor.

This happened to me a few weeks ago as well... I just put a bit more water in the tank.. I think the sensor must be pretty high in the tank.