The blinking may have nothing at all to do with the sensors.

First, unplug the relay in position 3 of the main relay panel and see if
the blinking problems persist.
This relay will have a big 43 or sometimes a 42 on the surface facing you.
You can drive around with this out. The temp gauge will still function
as before but the coolant level sensor will be disabled.

If the blinking issues cease while this is out then the problem is the
coolant level circuit.
If the blinking issues continue, then the problem is in the dash and
more steps are needed to isolate it.

Mark

Joy Hecht wrote:
> Hi folks,
>
> I think my coolant / temp sensor may be going, but I'm not sure, wanted your
> opinion.
>
> The blinking red light behind the temp needle has been going on when it
> shouldn't.  Sometimes when I turn on the engine, it goes on to show that it
> works, and then goes off - all as it should be.  But sometimes when I turn
> on the engine it turns on and then doesn't go off.  If I turn the engine off
> and back on, it will behave properly - go on and then go off.  or go on an
> stay on perhaps 60 seconds and then go off.
>
> ...............