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
Crashes / Fires:
0 / 0
Injuries / Deaths:
0 / 0
Average Mileage:
6,886 miles

About These NHTSA Complaints:

This data is from the NHTSA — the US gov't agency tasked with vehicle safety. Complaints are spread across multiple & redundant categories, & are not organized by problem.

So how do you find out what problems are occurring? For this NHTSA complaint data, the only way is to read through the comments below. Any duplicates or errors? It's not us.

2003 Chevrolet Trailblazer AC / heater problems

AC / heater problem

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2003 Chevrolet Trailblazer Owner Comments

problem #12

Feb 112007


  • 30,000 miles


The contact owns a 2003 Chevrolet Trailblazer. While driving 25 mph, the contact noticed that the fuel gauge was not registering the correct amount of fuel. Occasionally, the gauge would indicate that no fuel was present in the vehicle at all. The vehicle was not inspected and no repairs were made at that time. One year later, the temperature gauge, actuator on the air conditioning/heating system, and the speedometer failed. The vehicle was taken to the dealer and they confirmed that the actuator failed. The vehicle was repaired at the cost of $720. The manufacturer stated that no compensation would be provided because the failure was not under recall. The failure mileage was 30,000 and current mileage was 44,000. Updated 4/23/09 updated 04/28/09.

- Groesbeck, TX, USA

problem #11

Jan 012008


  • 37,200 miles
The contact owns a 2003 Chevrolet Trailblazer. The air conditioning and heating system would not cool or heat properly. In addition, the radio began shorting out and the blower motor stopped working. The dealer stated that the repairs would be the contact's responsibility because the vehicle was no longer under warranty. He has been to the dealer at least four times and neither the radio nor the vents have worked properly. The failures began within the first year of owning the vehicle. The VIN was unknown. The failure mileage was 37,200.

- Cleveland, OH, USA

problem #10

Aug 282007


  • miles
Purchased used 2003 Trailblazer with 22,052 miles in May not working properly..May 17, 2007 dealer replaced low pressure cycling switch..August 28, 2007 number 1 and number 5 speed stopped working on ac switch..

- Edgemoor, SC, USA

problem #9

Sep 012004

Trailblazer 6-cyl

  • Automatic transmission
  • miles


The contact owns a 2003 Chevrolet Trailblazer. The contact has a six month infant that is in a rear-facing child seat at the driver side rear. The air condition will not reach him. She tried other places in the vehicle but none seemed to help. When it is really hot outside child cannot get cooled off because air conditioner will not work.

- Apple Valley, CA, USA

problem #8

May 092003


  • miles
2003 Chevrolet Trailblazer plagued with defects. (nar) transmission, air conditioner, suspension, and rear windshield not working properly.

- Dewitt, MI, USA

problem #7

Jan 172003


  • miles
Consumer was stopped by a police officer, who informed consumer that the tail lights were out. Vehicle was taken to the dealer for inspection, and mechanic determined that tail lights needed to be replaced. Also, vehicle stalled while driving at any speed. The vehicle would hesitate and skip upon acceleration, at stop signs. Traffic lights and while parking on inclines. Multiple components were replaced to correct the problem but they recurred. The radio became extremely hot while driving on long trips. The radio was replaced but the problem continued. The A/C unit failed intermittently because of a faulty A/C switch. The consumer mentioned fuel system problems.

- Stockbridge, GA, USA

problem #6

Jan 282004

Trailblazer 4WD 6-cyl

  • 9,000 miles


I have had the exact problems as stated in 10047425. Windshield wipers went out completely on a rainy day, module replaced, A/C broke on a hot day-fixed, power steering assist stopped working completely making driving the vehicle nearly impossible, vehicle started on reserve power when temp hit -6 degrees, heater motor stopped working completely the next day -10 degrees. Basically this vehicle doesn't like changes in weather.

- Rochester, MN, USA

problem #5

Jan 142004


  • miles
Consumer took vehicle to repair shop because of the following problems; rack and pinion failed twice/air conditioner malfunctioned twice/vehicle stalled at take off/ oil leak, and brake lights failed to operate properly. Also, vehicle made a loud noise on driver's side while driving.

- Little Rock, AR, USA

problem #4

Feb 282003

Trailblazer 4WD 6-cyl

  • Automatic transmission
  • 2,392 miles
My 11-month old 2003 Chevrolet Trailblazer has had multiple quality problems, twice affecting my safety. Most of the problems have been electrical in nature. The 4WD has become inoperable numerous times, once while driving in snow. In another incident during a severe thunderstorm at night the air conditioner (A/C) failed and I was unable to defrost my windshield in order to see. After one dealer failed to diagnose the 4WD problem, another dealer replaced my ignition switch because the technician said I had no power at all going to the "rear grid." I continue to have intermittent electrical problems, including near stalling at a traffic light, and ongoing 4WD failures. The car also has very jerky motion when in 4WD reverse, of course, when the 4WD is working at all. The dealer told me that was normal and now I see there is a service bulletin on the problem.

- Arnold, MD, USA

problem #3

Sep 012003

Trailblazer 6-cyl

  • Automatic transmission
  • 4,000 miles
If the vehicle is turned on, when you turn on the A/C, the A/C pump will not turn on. You either have to turn the A/C knob on/off a few times to get it to go, or open the front hood, and tap on the A/C pump with your hand to get it to start. This happens at any point in driving or while in park. The A/C will not blow cold air unless you do as I have stated above.

- Brentwood, TN, USA

problem #2

May 082003

Trailblazer 4WD 6-cyl

  • Automatic transmission
  • 35 miles
Vehicle's dash gauges came on and speedometer started fluctuating after 35 miles driving and vehicle stalled out, not being able to restart. Computer was replaced by dealer. Problem arose again about a week later. GM had dealer replace another part in I believe the ignition key area. Check engine light came on again in a couple weeks and vehicle would not start for dealer after it was driven there. Dealer found wire connection in wiring harness to computer was not making continuous contact at a connection. Also dealer had to replace a switch when the A/C would work intermittently. Luckily I have a good efficient dealer and service department who cares about their customers.

- Montgomery, PA, USA

problem #1

May 012003

Trailblazer 8-cyl

  • Manual transmission
  • miles
My 2003 Chevy Trailblazer has been taken to dealership 2X for a problem with the air conditioner. Both times the dealer stated there is nothing wrong with the truck. My air conditioner does not work! to add to the problems there is no cold or even cool air from the vent position. The air is very hot!

- East Lansing, MI, USA

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