Hi,
The temperature sensor should be mounted just in front of the condenser/radiator, usually on the passenger side of the frame.
I have include a link that shows an actual picture of where the sensor is located on a 2001 model, and I'm pretty sure the model years 2000-2004 are the same.
The outside coolant temperature sensor on a Chevy Venture measures the ambient air temperature outside the vehicle. This information is used by the vehicle's climate control system to optimize heating and cooling functions, as well as to provide accurate temperature readings on the dashboard. Additionally, it can influence engine performance and fuel efficiency by adjusting parameters based on outside conditions. Proper functioning of this sensor is important for overall vehicle efficiency and comfort.
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Trouble code P0128 means: ECT Sensor Below Thermostat Regulating Temperature
It is in the front of the radiator area clipped to the radiator support.
under the hood on the passanger side in front of radiator
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.
GM Part #10248414 - Outside Air Temperature Sensor - located passenger side directly between radiator and grille; mounted to radiator frame left side.
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There's a small gap on the outer side of the left front fog light , I guess it's got somthing to do with the outside temp sensor .
location for 2003 chevy trailblazer coolant temperature sensor