04 Trailblazer coolant temp sensor

Need help with replacing the coolant temperature sensor.  Trying to troubleshoot some items to get the service engine light off, but not sure where the sensor is located.  I purchased a new one on the web, but need help with replacing it. 

Need to replace the coolant temp sensor, but not sure where it is.  Have a new one ready and waiting, just need to know procedure for replacing one. 

Need to replace the coolant temp sensor.  Have a new one ready and waiting, just need some directions. 

Turn the engine OFF.
Caution: Refer to Battery Disconnect Caution in Cautions and Notices.
Disconnect the negative battery terminal.
Drain coolant below the level of the engine coolant temperature (ECT) sensor. Refer to Draining and Filling Cooling System .
Disconnect the ECT sensor electrical connector (1).



Carefully remove the ECT sensor (1).

Installation Procedure

Notice: Use care when handling the coolant sensor. Damage to the coolant sensor will affect the operation of the fuel control system.
Notice: Replacement components must be the correct part number for the application. Components requiring the use of the thread locking compound, lubricants, corrosion inhibitors, or sealants are identified in the service procedure. Some replacement components may come with these coatings already applied. Do not use these coatings on components unless specified. These coatings can affect the final torque, which may affect the operation of the component. Use the correct torque specification when installing components in order to avoid damage.
If installing the original sensor or a new sensor without sealant, apply thread sealer P/N 12346004 or equivalent.
Notice: Refer to Fastener Notice in Cautions and Notices.



Install the ECT sensor.
Tighten
Tighten the ECT sensor to 16 N·m (12 lb ft).
Connect the ECT electrical connector (1).
Connect the negative battery terminal.
Refill the engine coolant. Refer to Draining and Filling Cooling System .