Could be, (assuming the starter is not cranking the engine)
a bad starter,
dirty or loose battery connections,
the engine is seized.
Drivers side on front of engine compartment
How do I reset the service engine light on a 2003 Chevy Trailblazer?
disconnect the battery
What would cause the engine not to restart when hot Chevy Trailblazer 2007?
Engine diagrams can be used as guides.. An engine diagram to a 2003 Chevy Trailblazer can be found in its maintenance and repair manuals.
Specs for main bearings on a 2003 Chevy trailblazer with 4.2 engine .
They are the standard GM style side post style. www.trailvoy.com Trailblazer enthusiasts forum!
Yes, if it fits the holder.
When you change the battery you automatically reset the PCM. Any time you remove the negative battery cable for about 15-20 minutes you will reset the PCM. This will reset your Check engine light also. www.trailvoy.com Trailblazer enthusiasts forum with all the answers for your Trailblazer.
where is the temperture sensor located on a 2002 chevy trailblazer with a 4200 motor
remove and replace engine coolant temperature(ect)/chevy 2004 trailblazer
If you don't have a code reader you can disconnect the battery cable for a couple of minutes and that will reset the light