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Coolant is typically changed every 30,000 - 50,000 miles.
Assuming repairs have been performed properly and there are no DTC's; you have an electrical problem.
Have the coolant changed immediately and you will be ok.
Replace the coolant thermostat. It is probably stuck in the open position.
No likely but possible if coolant is leaking out onto some electrical component.
The coolant light is supposed to indicate when the coolant level is low. If you're certain that the vehicle coolant level is up, check the electrical connections and finally the sensor.
The correct coolant is DEXCOOL it has an orange color to it. If your coolant is green the coolant has been changed. It has been found out that DEXCOOL was bad for Aluminum heads and gaskets. Best to switch to the green coolant.
if it is a 96 like mine it is on the top of the coolant resovoir. it is rounnd and has an electrical connector attached to it
Begin by removing the bottom radiator hose. Allow the old coolant to drain out. Replace the hose to its original position. Fill the radiator with new coolant.
Remove the drain plug from the bottom of the radiator. Allow the coolant to completely drained out. Replace the drain plug to its original position. Fill the radiator with new coolant.
It is not rust, but broken down extended life coolant. When Extended life coolant goes beyond the replacement time, every five years, it can break down and turn into a rusty sludge like substance. I would bet if you haven't changed the coolant in the car, it has never been changed.
THe fluid will need flushed and changed.