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Your overflow tank(aka coolant recovery reservoir) is low on coolant. The coolant expands when warm and raises the level in the tank, which turns off your light. Top off the reservoir (when cool) to the "Full Cold" line. If you have to keep adding on a regular basis, then you have a leak somewhere in your cooling system, could even be the reservoir itself.
Make sure there is no air in the system, take the radiator cap off and let the engine idle for half an hour, as the air comes out the coolant will go low, ad more coolant and then close the cap on also make sure the resevour bottle is at its mark.
The switch in the coolant tank that turns the light on can stick due to contamination from old coolant.Replace this switch,or leave it disconnected.If your battery drains overnight,there is likely a draw,possibly trunk ot glove box light on.If the problem started when the alternator was replaced,it could be a shorted diode in the alternator.
most cars and trucks have a censor on radiator or fill tank,ck the coolant level and if it is full then censor should turn lights off if it is low fill with water to full line and light should turn off
Did you add the fluid to the Radiator or the Overflow container. The radiator should be full and the overflow container should have a mark on it for full. Make sure both are full. If they are then you most likely have a bad sensor that you will need to locate and replace.