I started the '88 Wolfsburg this (cold) morning and the temp light started
flashing.  Kept flashing, kept flashing.  Checked expansion tank, it's
fine.  Drove it a little bit, one eye on the temp needle.  Arrived at my
destination, switched it off.

On the next startup, no flashing light.  Startup after that, no flashing
light.

I know this has been covered before, but I can't remember the cause or the
cure - a sensor wire?.  In the absence of a truly effective FAQ list, can
somebody tell me what's happening here?

Charles "Luke" Lukey
Seattle, WA