I just had my radiator replaced by a German car mechanic near where I live.
I took it it for a general maintenance checkup, and he said the radiator was
bad, although I never noticed any problem with it before.  Now, after
picking up my Westy and driving only 1 mile, the needle of the water
temperature gauge goes to the middle, and a red light starts blinking.  I
continued another 4 miles to my destination (church) and after the service
checked the fluids, and they were fine.  I checked behind the license plate,
and another reservoir in the engine area.

Of course I'll be taking it back tomorrow morning, but I'm wondering what
could have possibly gone wrong.  I have never before seen that light blink.
Could the sensor be malfunctioning?
Thanks.
Patti