Moving it lower would not help matters.  What seems needed is a sensor that detects when it hits air instead of coolant, and buzzes as soon as that happens.  Buzzes, not flashes.  When you have no particular reason to expect coolant loss, you can't do all your driving watching the light just in case it flashes.  Mine may have flashed before it buzzed, but if it did I certainly didn't notice it.  I stopped as soon as I heard the buzzer, but by then it was too late.

Joy

****************************************************************
Joy Hecht
and Matilda, 1989 Burgundy Vanagon

For musings about life and the vanadventures:
http://users.rcn.com/jhecht/gypsy

****************************************************************:::-----Original Message-----
:::From: Vanagon Mailing List [mailto:vanagon@GERRY.VANAGON.COM] On Behalf
:::Of Tim Demarest
:::Sent: Monday, May 23, 2005 4:25 PM
:::To: vanagon@GERRY.VANAGON.COM
:::Subject: Re: Joy Hecht's problem's solved?
:::
:::Hmm... sounds like a side-effect of the temp sensor being located near
:::the
:::top of the coolant system (where there will be nothing but air if you
:::dump
:::the coolant). Is there any benefit to moving the sensor to a lower point
:::in
:::the system?
:::
:::The light should flash as soon as the coolant level sensor hits nothing
:::but
:::air... so if that starts flashing, I'm pulling over!
:::
:::At 12:30 PM 5/23/2005 -0400, Don in North Carolina wrote:
:::>The coolant tank level sensor is supposed to warn you of this issue, but
:::in
:::>my experience it doesn't work very well at this - be warned!