One problem related to steering rack and pinion has been reported for the 2002 Chevrolet Trailblazer. The most recently reported issues are listed below.
Whining heard from engine area after warm up. Heard from 2000 rpm and up during acceleration. After reaching desired speed (city, highway, or rural) and maintaining steady speed noise goes away. Sounds like a imminent steering rack failure as dealer has changed p/s pump, changed fluid, and flushed lines trying to correct problem to no avail. Happens upon every start and accelerate.