David,

The Red light you're talking about is supposed to flash to indicate low
coolant level in the expansion tank.

The Wasserboxer's expansion tank has a probe that screws into the top
where a wiring connector is attached.  The probe extends down into the
tank and electrical connection is made by the liquid in the tank.
Should the liquid get low enough that there is no longer conductivity,
the red light will flash.

Sorry, It's not a high temperature warning light.

Mike

David Yates wrote:
> This will be simple for those who know . . but . . I�ve had an �86
> instrument cluster in my �82 Vanagon (with a Subaru engine) for several
> years.  I have the temp gauge �calibrated� by putting a resistor in the line
> as this more or less matches the sensor to the gauge. The needle sits in the
> middle of the dial when the engine has warmed up.
>
>
>
> When I turn on the ignition, the red light flashes a couple of times and
> goes off.  I gather this is something to do with coolant level in the
> original vehicle (there is no sensor  my setup).  Is this correct?  Is the
> red light supposed to come on when the engine overheats?  If so, when/how?
> I had a couple of times when the engine overheated but the light did not
> come on.  It would be good to have this warning.
>
>
>
> Any help please?  I�d know the answers if I had a later model van, I�d
> guess.
>
>
>
> Thanks.
>
>
> Dave
>
>