Huge win for car owners! All TSBs to be made public. The Center for Auto Safety just made the NHTSA (US Government) make public the full text of all TSBs from now on. They are the same organization that has petitioned the NHTSA & filed lawsuits to protect car owners over exploding gas tanks & other major safety issues. Whenever you drive in your car, you are safer thanks in part to a lot of work over the years by this small but very effective consumer advocacy group.

Please take a moment & say thank you by donating $5 or whatever you can to the Center for Auto Safety. Notes: Carrying the not-so-proud traditions of its 2002 predecessor, the 2003 has a handful of instrument panel malfunctions that can leave you guessing your speed, engine temperature or how much gas is left in the tank.


pretty bad
Typical Repair Cost:
No data
Average Mileage:
57,500 miles
Total Complaints:
2 complaints

Most Common Solutions:

  1. not sure (2 reports)
2003 Chevrolet Trailblazer AC / heater problems

AC / heater problem

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2003 Chevrolet Trailblazer Owner Comments

problem #2

Jul 112007

Trailblazer LS 5.3L 6 cyl

  • Automatic transmission
  • 50,000 miles


Airflow control servo quit working. Could only get cold air from flipping the control knob to defrost, Couldn't get any cold air out of the front vents. Made for tough driving on hot, humid nights. Windshield wanted to fog over. Made a simple redneck solution and put a cover over the defrost vent to blow the air out to me and keep it off the windshield. It helps but having the flow control working proper like it's supposed to would be way more convenient!

- , Lancaster, PA, USA

problem #1

May 012008

Trailblazer LT EXT 4.2L 6 cyl

  • Automatic transmission
  • 65,000 miles

My TB has a rear zone control. At some point it decided that the rear zone no longer needs heat. I've checked it multiple times and one various settings - feet, head, both - and it just won't blow hot air out the rear vents, just cold. Though I think every once in a while it does give warm air. Still screwed up though. Since I keep blankets in the back and the kids are not complaining too loudly, I'll just put up with it. I'm afraid to find out how much it will cost to fix...

- , Paoli, PA, USA

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