Aha!  Mine has the little puddle around the sensor, but I thought it was a
worn out O-ring.  My dash coolant light only blinks when I am starting the
engine, not ever that I've noticed when I am driving.  Couldn't it just be
the O-ring?  Since my light doesn't blink continuously, but does at start
up, wouldn't that indicate the sensor for the guage is still OK?

Jim Creech

> >  It's a coolant level sensor. It causes the LED to blink when the
> >  coolant drops below a certain level.  It will also blink if you don't
> >  have enough coolant in the coolant/water mix.
> >
> >  And they typically fail such that they won't blink at all if the thing
> >  cracks allowing coolant up inside the plug where the contacts are....
> >  sometimes it fails such that the light blinks all the time...
>
>  ...and,if they crack,allowing coolant up inside the contacts it can
>  also start leaking out the top of the sensor plug,making a pool of
>  coolant (or at least the evidence of where it's been) in that little
>  depression around the plug.