Look under and just to the left of the thermostat. JK
It is in the bottom of the over flow tank.
check coolant sensor float most common problem.
It is at the bottom front of the coolant reservoir.
Trouble code P0118 means: Engine Coolant Temperature Circuit High Input Replace the Coolant Temp Sensor
The Engine coolant temperature sensor is installed in a coolant passage which is located at the front left cornerof the cylinder head.
It is right below the thermostat housing on the drivers side of the engine, below the throttle body.
The coolant level sensor is bad
Try rear side of radiator approx. 1/3 from the top
try unpluging the sensor in the overflo bottle. it could be dirty, or no good
where is the location posslook sensor three wires , 2000 pontiac sunfire
The coolant fan sensor is the same as the sensor that shows the coolant temperature on the dash gauge. It is located on the intake manifold.