Have you removed/disturbed connector from temp sender unit, I think high resistance (infinity) = high temp?

EDIT: See later post re resistance.

98 Mystique LS v6 atx 110,000km
97 Contour LX v6 atx 125,000km
stock CD on LS, cass on LX
spoiler, tinted windows on LS only
4 wheel discs on LX only
All other available options on both