the AT oil temp light in the 98 lgt will blink a few times after start up...
the owners manual says "If the light flashes after engine starts, it may indicate that the automatic transmission control system is not working properly."
any dents on the bottom of the tranny pan? my borther in laws outback does it, and after discussing with joel a few times we figured somebody bottomed out the tranny pan and it hit one of the solenoids in there so the awd won't shut off and the a/t temp light is the self diagnosis letting you know something ain't right