My 2002 Trail Blazer has developed a squeak. It is affected by outside temp and weather. It is intermitted but more prevelant in cooler weather. I have taken it to the Chevrolet Dealer four times to resolve it but to now avail. So far we have replaced bushing, tie rods, and the front end bumper. It sounds like a suspension squeak to me. Can anyone suggest a solution. It is a 4WD.