Having problems with your 2004 Chevrolet TrailBlazer ?
How do I change the air filter on a 2004 Chevrolet Trailblazer?
The air filter is in the right (passenger) front corner of the engine compartment. Use a screw driver to remove the four screws securing the cover and the air filter comes out. Be careful not to drop the screws as it's easy to do and you'll likely never find it again. Good luck.
Repair Help & Product Troubleshooting for 2004 Chevrolet TrailBlazer
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