Its on a part called the "gooseneck". follow the upper radiator hose to the engine. It hooks to the gooseneck which houses the thermostat. The sensor will have a wired plug hooked to the top. This is an incorrect answer above. The temp sensor is in the driver's side head,between #1 & 3 cylinders. There is one green wire going to it.
Under the thermostat
On a 2001 Monte Carlo it is located on the radiator just below the radiator cap.
Check coolant level in recovery tank Perhaps a bad sensor. Sensor located in coolant recovery tank
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
The temperature sensor is located on the driver's side under the radiator hose, on top of the intake manifold.
Look where the thermostat is attached to the intake manifold
The intake air temperature sensor is located in between the mass air flow sensor and the air filter. Its the sensor in the plastic tube that connects the two.
Where is hood open sensor on 2006 Monte Carlo
See a dealer
Where is outside temperature sensor 2003 Monte Carlo SS
The Intake Air Temperature sensor is located in the air intake duct between the air filter and the throttle body
There are several temperature sensors on a 2001 Chevy Monte Carlo. A temperature sensor for outside temperature is located near the passenger side wheel underneath the vehicle. A manifold temperature sensor is located in the manifold. There is also an air temperature sensor in the hose that leads from the air filter to the motor. Still another temperature sensor is the thermostat in the upper radiator hose near the water pump.