This circuit seems to be prone to infestation by gremlins.  My '91 did
the same thing for a while about a year ago; tank full, not hot, light
would flash for a while after starting.  After a few weeks it stopped
flashing.  You might search for some of the old posts by David Beierl (sp?).

Larry A.

Blake Thornton wrote:
> I started up my 84 today to have the coolant light flash for about 5
> minutes before finally turning off (the flashing light there by the temp
> gauge).  There is no way my van was overheated (it hadn't been running).
>
> Any ideas?  My sensor that is in my coolant resevoir is brand new with a
> new o-ring (and is possibly leaking, but not much).
>
> Thanks for any thoughts!
> Blake
> St Louis
>