Ahh, I think I know the answer to this, and it is quite easy. Make sure your coolant tank lid is VERY tight. There's a little groove that the top fits into. Make sure it is flush.
I have had this happen to me several times: the light would come on, with adequate coolant in the reservoir. I shut off the car, tightened the cap, turned the car back on. It's as simple as that.
I hope this solves it.
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2000 Dodge Viper RT/10 - TNT 300 shot, VEC2, etc.