> It is supposed to blink at start up for a few seconds and then go out.
> This tells you the system is working.  People say it will blink if your
> antifreeze/water mix is off, but I'm not sure it is that smart.  When they
> leak, it is usually at the electrodes.  It then pushes  up into the plug.
> I've never seen one that leaks blink because the leakage simulates a full
> tank.

I think you have it backwards.... if the plug is full of coolant the light
would NOT blink because the coolant touching both contacts in the plug would
similate a full tank.

Bill