Okay, pardon me, I know there are probably enough threads about this to tie
up an elephant, but. . .
I am driving over the coast range yesterday with a pretty full load of gear,
when the temp light starts flashing.  Strange thing is that it happened after
I began to descend into one to the many valleys into the coast range, not on
the climb.  The temp gauge never budged from dead center, yet the blinking
idiot light is going like crazy.
Okay, so I pull over and lo and behold, the water reservoir behind the
license plate is empty!  In goes one liter of fresh water.  Start up Odell
and everything is groovy for about another ten miles, then the light again,
again on the descent!

We pull over, let it sit for a minute.  I check the water level, no problem.
Start it up and everything is fine. Hmmmm.

Again, ten miles on, the light, this time on a gentle descent, with  no real
stress on the motor.  Okay, so I put it in Mexican overdrive, kill the motor,
and start it back up.  No light!

So, is this just a bubble from an unbled cooling system, a bad water pump, or
a psychotic idiot light/ sender?

DAR
Odell the Adventurewagen - 1987 Vanagon