How long did you wait? After disconnecting the sensor it normally take a
short while for the relay to trigger the light. This is to reduce the
false alarms. 30 seconds should be more than enough.

If the light still does not start blinking you may have a missing relay.
   There are a few other possibilities as well. Someone may have
disabled it to stop alarms they could not figure out how to fix. Pulling
out the relay is the surest way to stop the alarm from triggering.

Mark

pickle vanagon wrote:
> I have been wondering whether my coolant level sensor is faulty, since I
> don't remember every seeing it come on when I've done coolant flushes, etc.
> My understanding was that the sensor is just a conductivity sensor, so that
> unplugging it should make the system think the coolant is empty.  However,
> when I unplugged mine, and then started the van, the light flashed for a few
> seconds like always, then went out as always, seemingly suggesting that the
> level is fine.  What could be going on here?
>
> Thanks,
> Wes
> '83 westy
>