I have now figured out the blinking red light syndrome.  I found a steep
incline, ie 30 +/- degrees, and filled the rear tank.  Problem went away.

Next step is to change coolant.  I have looked, but cannot find the drain
plug.  Any suggestions where I might find it??

I have followed the coolant mixture thread, and I have always heard that
50-50 mix is the only way to go.  Any more/less and the chemistry of the mix
no longer lowers, but raises the freezing point, as well as decreasing the
ability to transfer heat in summer.  The solution is actually better than
straight anti-freeze.

Thanks
jcal