I believe the coolant light circuit measures resistance between the two pins
of the sensor in the plastic tank.  If the resistance is out of range then
the light will come on.  If the coolant is low or sloshes away from the
sensor pins then the light will come on.  If the coolant has too much
antifreeze then the resistance between the pins will be out of spec and the
light will come on.  If the pins are dirty or corroded then they might read
incorrect resistance.  There could also be a fault in the wiring for the
light that could cause the light to come on.  I don't know how to test the
sensor.

That all I have.

On Fri, 16 Sep 2022 05:57:37 -0700, David McNeely <davmcneely40@GMAIL.COM>
wrote:

>Doesn't the coolant light indicate the level of coolant, not the
>temperature?  I have actually had it come on when I hit a rough spot in the
>road, back some years ago.  Bouncy, bouncy, and the light blinked on and
>off.
>
>On Fri, Sep 16, 2022 at 5:16 AM Ed McLean <email99@nc.rr.com> wrote:
>
>> The original note was a short question asking why the coolant light would
>> turn
>> on and off at random times for no apparent reason while the temperature
>> gauge
>> remained in the normal range.
>>