How to Change Coolant Temperature Sensor on Chevy Trailblazer LL8 I6 Envoy Bravada Rainier 9-7x

Replacing a coolant temperature sensor as a possible cause for an OBDII code P0128 on a 2004 Chevy Trailblazer with Vortec 4200 engine, also referred to as the GM LL8 I6 which is found in the following vehicles - 2002–2009 GMC Envoy, Envoy XL, and Envoy XUV 2002–2009 Chevrolet TrailBlazer and TrailBlazer EXT 2002–2004 Oldsmobile Bravada 2004–2007 Buick Rainier 2003–2008 Isuzu Ascender 2005–2009 Saab 9-7X