I have a 1990 Maxima SE Auto. The temp gauge occasionally falls to the way cold while driving, and just hangs there for like several minutes, then will go back to the normal middle positsion right between the Cold and Hot marks. Does this mean that the sending unit for the temperature gauge is going bad? Where is this sending unit located? Thanks.

-V

btw, the car as 213,000 miles on it, about to turn 214,000.