How do you adjust the pressure on a rear window wiper blade 06 Chevy trailblazer?

The 2006 Chevy Trailblazer's rear wiper blade pressure isn't adjustable in the same way as some front wipers might be. There's no knob or lever to change the pressure. The pressure is determined by the spring tension in the wiper arm and the design of the blade's contact point.

If you feel the rear wiper isn't making good contact or is leaving streaks, the problem likely isn't adjustable pressure, but rather one of these:

* Worn or damaged wiper blade: This is the most common cause. Replace the entire wiper blade assembly. A new blade will have the correct pressure built-in.

* Dirty or damaged wiper arm: Check the wiper arm for any bends or damage that might prevent proper contact. If it's bent, you might be able to carefully straighten it, but replacement might be needed.

* Dirty or damaged rear window: A dirty or scratched rear window can interfere with wiper performance, even with a new blade. Clean the window thoroughly.

In short, you don't adjust the pressure. You fix the underlying problem causing poor wiping action by replacing the wiper blade (most likely).