You can buy a shop repair manual. Haynes or Chiltons are the preferred choices as they are your less expensive options.
We have complete instructions and pictures at our enthusiasts website www.trailvoy.com
This answer will vary with what's wrong and which shop looks at it.
On a 2003 Chevy Trailblazer, the speed sensor is typically located on the transmission. Specifically, it can be found on the driver's side of the transmission case, near the output shaft. To access it, you may need to remove some components for better visibility and reach. Always refer to a repair manual for detailed instructions and safety precautions.
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The throttle body needs to be cleaned. Instructions are on our forum at www.trailvoy.com
buy a haynes repair book at your local parts store it has detailed instrutions
The transmission control module (TCM) on a 2003 Chevrolet Trailblazer is typically located on the side of the transmission itself, near the rear. It can be found mounted on the transmission housing, often towards the driver's side. To access it, you may need to lift the vehicle and remove some protective covers or components. Always consult a repair manual for detailed instructions specific to your vehicle.
It could be coming from your heater core, may need to repair or replace it.
It pulls off. Sometimes easier to remove the headlight assembly to change the bulb. We have instructions at our forum. www.trailvoy.com Trailblazer enthusiasts!
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