This happened on my '97 a couple of times last year and I tried unsuccesfully to find its meaning in my service manual. The owner's manual says take to dealer. The flashing would usually stop after stopping and immediatley re-starting the car. Problem went away but there were never any noticable symptoms given by ATX operation; fluid level and color were OK at all times. Now, say 10,000 miles later ATX is still working OK.
I searched problem forum under "O/D light" at the time and saw some tales of woe. You may wish to search and review past posts.
In general in seems that, other than proper fluid level and perhaps fluid changes, there are few "little" atx problems that can be solved by DIY owners.
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
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