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Engine coolingPart report

2005 Chevrolet Trailblazer EXT 370 Engine cooling Problems

Complaints
10about this part
Share
4%of 237 total for the year
Median mileage
57,900miles
Trend
Not enough dataFewer than 15 complaints, too few for a reliable trend.

NHTSA recorded 10 complaints about the engine cooling of the 2005 Chevrolet Trailblazer EXT 370, 4% of the 237 complaints for this model year. Where a mileage was given, the median is 57,900 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.

“While driving my 2005 chevytrailblazer it just turned off without warning, as soon as it did the check engine light and reduced engine power light came on(instrument panel and radio were still working). I tried a few times to turn it back on but it failed to restart. 15 minutes later it restarted and I was able to drive to my workplace a few blocks away, by the time I used my vehicle again(about 3hrs later) both engine lights had turned off. …”

NHTSA complaint #10592835, filed 2014-05, 77,000 miles

“My chevy trailblazer 2005 model accelerated in the parking lot as I was turning it on and put it in drive with my foot over the brake, it accelerated and jumped 3 feet before I stopped it. I am very thankful, no car was in front of me!”

NHTSA complaint #10310408, filed 2010-02, 33,333 miles

“I have a 2005 trailblazer ext purchased new in july 05. Recently while driving, the car had reduced engine power, the check engine light then came on then my car just shut off. It started back up after pulling off the road but had to endure this the entire time while driving home. When I took it in for diagnosis I was told the accelerator pedal sensor needed to be repaired after having that repaired I drove home and the same thing happened with the check engine light and the car shutting off while driving. …”

NHTSA complaint #10276331, filed 2009-07, 76,186 miles

“2005 trailblazer. Middle of high way engine stopped and instrument panel went crazy. Some time later ignition key worked again. I changed battery but it happened again and when I turned the ignition key to start the engine, sometimes is work and sometimes id doesn't. The dealer wanted me to pay for diagnosis fee my car is 46000 out of warranty and as I check internet forum some people have the same trouble and dealer covered the money how can I protect my family with the engine stopping in middle of highway!!!!!!!!”

NHTSA complaint #10184743, filed 2007-03, 35,999 miles

“My 05 chevy trailblazer ext lt with 4.2 l cracked its exhaust manifold at 85,000 kms. Gm dealership in 2 different cities refused to repair under warranty. This truck was purchased as a new used demo from the original dealership with 14,000kms may 06.”

NHTSA complaint #10355014, filed 2010-09, 52,800 miles

Related service bulletins

Engine cooling: other model years

YearComplaintsShare of year
200616%
2005104%
200417%
200317%

Other parts of the 2005 Chevrolet Trailblazer EXT 370

Electrical system
101 complaintsFuel system
94 complaintsExterior lighting
15 complaintsVisibility (wipers, defrost, mirrors)
12 complaintsVehicle speed control
8 complaintsAir bags
7 complaintsBody and structure
6 complaintsTires
5 complaintsTransmission and drivetrain
5 complaintsEngine
4 complaintsEquipment
4 complaintsLatches, locks and linkages
4 complaints

← All problems reported for the 2005 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