I recently flushed and filled my coolant system and had the same issue.
Bubbles, I suppose, in the system took on more coolant as the bubbles left
the system. I just topped it off when I noticed my FULL-Cold line wasn't
quite full. Nary a problem since.

Otherwise, it might be a sensor issue. Check the obvious first (levels) and
proceed from there. Good luck.

Barry
'94 SL2 167000 miles.

"reex01" > wrote in message
lkaboutautos.com...
> The Temperture and Low coolant lights blink simaltaniously on my 1991 SL1
> until the engine gets to normal operating temperture. Then they usually go
> off, but sometimes they will start blinking again. The coolant level is
> full (I just flushed the system and refilled to be sure that wasn't the
> problem. All other fluids are at the full level. The car is not
> overheating (the temp. gauge never goes much past the first mark). Any
> idea what is causing these lights to blink? Nothing said about it in the
> owners manuel.
>