Rear AC

They do sell block off kits for the suburbans, actually put the kit on my personal suburban, but wasnt real happy with the cooling on real hot days, I should rephrase that, my back passengers werent happy, Anyways not sure if they sell the kits for Trailblazers, thats something that you would have to call around auto parts stores to find out, Now some shops will repair A/C lines, but if you have a leak now, more leaks arent far behind, and I would recommend replacement.

There is a web site calll www.streetrodguys.com that has rear a/c block kits for just about any vehicle including the trailblazer. They also have a/c line repair kits that can be used to bypass a bad section of the line. here is the link for the trailblazer

http://www.streetrodguys.com/component/page,shop.product_details/flypage,flypage.tpl/product_id,57/category_id,30/option,com_virtuemart/Itemid,1/

They are very inexpensive and very easy to install. I have installed many of them. I have on occasion seen some other ones but I have always had to send them back because they leak or the fitting was incorrect, I have never had a problem with any from that web site. Highly reccomend them!