2003 Chevrolet Trailblazer EXT 370 Engine cooling Problems
- Complaints
- 1about this part
- Share
- 7%of 14 total for the year
- Median mileage
- 157,000miles
- Trend
- Not enough dataFewer than 15 complaints, too few for a reliable trend.
NHTSA recorded 1 complaints about the engine cooling of the 2003 Chevrolet Trailblazer EXT 370, 7% of the 14 complaints for this model year. Where a mileage was given, the median is 157,000 miles.
Fewer than 15 complaints name this part, so treat the figures as a rough indication only.
Example complaints
Selected from NHTSA records; personal details are removed. They are consumer reports, not findings.
“Exhaust bolts have broken on the exhaust manifold, this vehicle has the v8 engine. Dealer explains that this needs fixed as carbon monoxide could enter the passenger cabin. There was an accident with the vehicle a year ago, I contacted my insurance company to see if it was related to the accident. They claim that it is not related to the accident and that GM vehicles model year 2000 to 2007 with this 5.3 v8 engine have reported these bolts breaking and informed me to contact GM about reimbursement for repair expenses. …”
NHTSA complaint #10434887, filed 2011-11, 157,000 milesRelated service bulletins
- 10251887Mar 14, 2024This bulletin advises the technician of possible location of an internal coolant leak from a specific cylinder head and location.
- 10251890Mar 13, 2024This technical bulletin advises of a new fuel injection cleaner kit used for decarbonizing the intake valves to correct conditions of rough idle, Crank no start, extended crank…
- 10250775Feb 22, 2024This service bulletin provides service information to technicians on guidelines to replace Oil Cooler, Oil Cooler Lines and Oil Tank if the engine was replaced where large…
- 10249579Jan 12, 2024This PI bulletin advises the technician on the proper way to install the pistons in an engine.
- 10242843Sep 1, 2023The service bulletin advises the tech of a normal transmission shift condition and the delay in throttle response when the throttle plate is opened rapidly and advises the…
- 10242262Aug 24, 2023This service bulletin provides graphics, information and guidelines for engine component wear to assist service personnel as a guideline to perform necessary engine repairs and…
- 10235802Apr 24, 2023This diagnostic tip bulletin provides additional information on how to diagnose a possible valve, lifter or camshaft issue.
- 10234141Mar 23, 2023This diagnostic tip bulletin provides additional information on how to diagnose a possible valve, lifter or camshaft issue.
- 10234110Mar 17, 2023This service bulletin provides service information on new torque specification and installation procedure for ACDelco Spin-On Oil Filters.
- 10228888Dec 14, 2022This service bulletin provides diagnostic tips/steps on testing for possible EVAP leaks in the system to correct a customer concern of an MIL Illuminated with DTCs P0442 and/or…
Engine cooling: other model years
Other parts of the 2003 Chevrolet Trailblazer EXT 370
6 complaintsFuel system
3 complaintsExterior lighting
2 complaintsVisibility (wipers, defrost, mirrors)
2 complaintsElectronic stability control
1 complaintsEngine
1 complaintsBody and structure
1 complaintsTires
1 complaintsWheels
1 complaints
← All problems reported for the 2003 Chevrolet Trailblazer EXT 370
About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Oct 29, 2026. Complaints are unverified consumer reports and may be duplicated or inaccurate.
To check a specific vehicle for open recalls, use its VIN at nhtsa.gov/recalls. Methodology