Bman2000

anyone had this problem my coolant light comes on when the car is cold. only recently. and it comes on because the coolant level is actually low, ive checked...but if i turn the car off and back on then it goes away and wont come back for the rest of the day...im trying to figure out what...all i can think of is maybe an air bubble? i just dont want to put more coolant in there if it doesnt need it...any ideas?