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  1. K

    air pump relay blows

    Does anyone have an idea what is causing my air pump relay to blow every 3 to 6 months? (the one under driver seat on chassis frame) Have replaced it 5 times since I owned it, less than 2 years. I have a 2008 trailblazer L6. I have used NAPA brand, Omni brand, GM brand, makes no difference...
  2. K

    SOLVED! Loud roar , speed related.

    I have a 08 trailblazer, 4.2L 6. Upon driving I hear a very loud roar, that is speed related. When slowing and braking the noise "winds" down accordingly. I have replaced the fan clutch, and the emissions valves, solenoids, and air pump are all functioning as they should. I seem to notice...
  3. K

    wheel bearing noise

    Think I finally figured out I have a bad wheel bearing , which is making for a loud noise , going straight. I can't remember for sure, but I believe you determine which bearing is bad in the front by putting it under load. If I turn the steering wheel to the right and the noise continues, but...
  4. K

    overdrive?

    Have a 07 trailblazer, L6 motor. Does anyone know how to tell if their Overdrive is working or not? Sounds stupid, but the truck shifts through all 4 gears, but doesn't seem to go into overdrive gear. It appears the rpms are all correct at shifting intervals, but on acceleration the engine...
  5. K

    P0411 P2432 codes

    -------------------------------------------------------------------------------- Anyone have advice with a persistant P0411 fault code? I have replaced the control valve (to throttle body), the pump, and relay. Everything worked well for 2 weeks, then it through the code again yesterday and...

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