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?