Is it running at the right temperature and is there coolant in the system and has it been refilled recently?
Possible reasons are the sensor is faulty, it really is running hot or there is an air lock.
Also look at the connection to the coolant sensor, check its not corroded.
Try replacing sending unit located on engine that connects to coolant light.
SOURCE: The low coolant light stays on in my 2002 monte carlo
Ur coolant level sensor might need changing. If not, the circuit associated with the coolant level sensor needs to be inspected
SOURCE: 2000 Monte Carlo SS (89,000 mi)
That slushy brown stuff is signs of a blown head gasket. Have a code scanner hooked up to find out why the light is on, it will probably show coolant temperature sensor. Just out of curiosity, check the pvc valve (if your car has one), and see if it's clogged. If it is replace it, the crank case is not getting ventilated.
SOURCE: changed coolant sensor on 99 monte carlo, cleared computer, light
Which coolant sensor did you change? The one in the passenger side tank in the radiator.
SOURCE: 2000 monte carlo transmission
Well the tag is on the backside of the transmission closer to the firewall....I imagine one is the 4t65ehd which is the heavy duty and the other is the normal non supercharged version.. What a place for it huh lol
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