Just purchased a few weeks back a 2003 Trailblazer Ext 4wd with 142,000 miles for my soon to be 16 year old son to drive. He loves it and now may have to fight mommy for it. She has been driving it to see if any issues pop up. The only issue we knew up front was that the rear hvac system did not...

First off, I want to say this is an amazing forum. I have learned a lot about my Trailblazer from reading here. I do apologize if I have posted this in the wrong place. I did a search and could not find an actual topic concerning my question. I have a 2002 Trailblazer LT EXT 4x4. I need to...