How do you fill the rear windshield wiper fluid on a 2003 trailblazer?

The 2003 Chevy Trailblazer doesn't have a separate reservoir for the rear windshield washer fluid. The rear wiper fluid is drawn from the same reservoir as the front windshield wipers. Therefore, you fill it by adding washer fluid to the main washer fluid reservoir, usually located under the hood. Look for a large plastic bottle with a cap; it's often translucent so you can see the fluid level.