2003 Chevrolet Trailblazer Ext engine and engine cooling problems
16 owner complaints filed with NHTSA name the engine and engine cooling on the 2003 Chevrolet Trailblazer Ext — 5% of all complaints for this model year.
What owners report
“Thermostat has failed twice during long trips. This causes the engine to run hot or cold. I am on my third one and have concluded it must be a design defect. Failure of this component may cause the engine to fail and thus strand the driver. *tr”
filed Jul 19, 2010
“I purchased a 2003 chevy trailblazer ext in june,2007. In jan of 2009 my problem first began. While driving normal speed, the service engine light sometimes comes on immediately followed by the "reduced engine power". When this happens, the car immediately loses power and the vehicles only goes…”
filed Dec 10, 2009
Verbatim excerpts from complaints filed with NHTSA. Reports are not independently verified.
Related service bulletins
This bulletin advises the technician of possible location of an internal coolant leak from a specific cylinder head and location.
06-06-01-019C · Service Bulletin/Repair Instructions · issued Mar 14, 2024
Engine and Engine Cooling problems in other Trailblazer Ext years
| Year | Reports | Share |
|---|---|---|
| 2006 Trailblazer Ext | 4 | 2% |
| 2004 Trailblazer Ext | 16 | 6% |
| 2002 Trailblazer Ext | 14 | 14% |
Other reported problem areas on the 2003 Chevrolet Trailblazer Ext
Counts are unique NHTSA complaints naming this component group. Complaints are unverified owner reports; mileage is computed only from complaints that included a usable odometer reading.