One problem related to water pump has been reported for the 2006 Chevrolet Trailblazer. The most recently reported issues are listed below.
I just want to get some information out there on my experience: battery replacement seem ways too often 8/2008, 10/2010, 9/2013 - and there is no notice until you cannot start it one day. First thing to go was the idle pulley. I have had the water pump/thermostat/belts replaced multiple times 50k, 60k, 87k. Headlights and tail lights replaced at least 3 times each. I have had to clean the throttle block plate multiple times or the tb will stall when the brake is applied or heat/ac on. I have come to find out that there are many non-oem parts which I never replaced (I purchased used w/17k miles) and nothing showed up on car fax or other reports about accidents or repairs. I had the gas guage/tank/float repaired while it was under warranty still and then a year later it broke again, and I am still riding with it broken (at least the last 5 years), which of course keeps my check engine light on nearly all the time. I just located the notice that gm is now doing 100% of the repair and I will be making an appointment to get it fixed as I will not pass inspection and I never know how much gas I have. I fill every 200 miles. There are other minor issues such as interior lights going out, both of the front seats have detached from the side molding (only 1 little screw holds them in), the rear washer has not worked in about 6 years. I also have loud noises coming out of the tires/wheels and no one can determine an exact cause, but it's not the brakes or rotors or anything like that. I currently have under 89k miles. I am waiting for the door electrical system to go next as that seems like what is next on the list of tb issues.