I also had this kind of mysterious squeaking in the front end of my 02
Trailblazer. Came off and on, drove me crazy. Finally I found out that it
came from a loose bumper and a loose plastic mud protection in the right
wheel house. They are clamped with plastic nails to the metal body of the
car. And these nails came loose, so the bumper and the protection started
rattling and squeaking. I replaced most of them with solid srews and
Bingo! - no more squeaking.
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