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On a 2001 Monte Carlo it is located on the radiator just below the radiator cap.
It is on the bottom of the radiator just below the lower radiator hose.
Radiator full and coolant recovery tank filled to mark Radiator full and coolant recovery tank filled to mark
Look at the bottom or rear of radiator
look on the bottom corner of the radiator, either on drivers side or passenger side.
the coolant sensor is in the radiator on the passanger side the oxygen sensor is in the exhaust system on the manifold and the pipes and sometimes both
many possible causes, low coolant, worn out coolant, bad thermostat, no circulation (water pump) radiator blockage, pressure loss somewhere
did u bleed the coolant system of air cuz that could be the reason
how to change a radiator in 2001 Monte Carlo
should be mounted on the radiator side either front or back and has a plug held in by a clip.
Look on passenger side of radiator about 6 inches down on the side its right there.
Did you change the radiator? If you did you might have the wrong one,without a full provission for the sensor. If you did not the plug might be disconnected or faulty.