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Driving down the freeway and heard a noise from under the hood (happened twice). Sounded like an air dryer purging -no big rigs around. Checked for blown air to air ect, nothing. Will see if I hear it tomarrow, if not I'll drop it of my worry list.
could have a leaky hose that's failing under boost.. or worse yet, the inner cooler. not sure if yours is plastic or not, but he early 2004/5's had a plastic one that was cracking and being replaced under warranty. with your truck being older IDK...