coolant sensor....is it on the left side of the steering column and orange (you say: why yes? how the hell did you know?) well, partly becuase i am a genious phsycic, and partly becuase this question gets asked about twice a week... jsut fill up your coolant resevoir to about a half inch above "MAX FILL" line immediately! keep a very close eye on your temps too, i would replace your waterpump if you've logged over 50,000 miles on the car as well
Silver 1998 Mystique LS (v6)...ATX

Removed Emblems, limo tint, painted calipers.
Premier P630 HU with 4 Pioneer TS-A6895 Speakers with 10' Sony sub (yeah i know, i'm cheap)
Commando 501-S Alarm