High Coolant Temp and Low Coolant Warning Lights flashing

The High Engine Coolant Temperature and the Low Coolant Level Warning Light comes on and flashes intermittently when I am going at low speeds. Usually when the car is still cold. The coolant level is normal and the car is not over heating. I replace the fluid resevoir that has the sensing unit built in but it still does this. Any advice?

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I have this same problem. Have a 1997 SC2. I have replaced the temp sending unit, car is not over heating and coolant is not low. Fan is turing on when it should also. What would be causing this light to itermitently to flash. It seems to have a mind of its own of when it flashes. One more thing I have read that sometimes it is the BU fuse that is blown that would cause this...not in this case!
Thanks