John Rodgers wrote:
 > I suspect that if you do not have the ratio of water to coolant within
 > the proper range, that silly light may blink - maybe.

I can say, from the experience of four different Vanagons, that filled
with plain water, the light, on properly working systems, won't blink.
That 50/50 ratio tale is just another Vanagon myth.

Turning on the key and waiting for a period of time, does indeed work to
tame a blinky light, if the capacitor in the gauge is becoming
electrically leaky.

Mike
Glade Spring, VA/Houlton, ME