One problem related to steering idler arm has been reported for the 2007 Chevrolet Trailblazer. The most recently reported issues are listed below.
At 45,000 miles I have had to have the tierods replaced and there is still something wrong with the passenger side wheel assembly, but they can't seem to figure out what the squeak is. It could be a bearing I have been told, but they don't know without tearing it all down. 2nd is the power window on the drivers side is getting slower to come up and I can smell wires burning at times (although I am not sure if the 2 are related) I have also had to replace the "idler pulley" at 42,000 miles. . . . . This seems ridiculous as it keeps turning out to be one thing after another?????.