Skip to content
Engine coolingPart report

2006 Chevrolet Trailblazer EXT Engine cooling Problems

Complaints
4about this part
Share
2%of 189 total for the year
Median mileage
61,000miles
Trend
Not enough dataFewer than 15 complaints, too few for a reliable trend.

NHTSA recorded 4 complaints about the engine cooling of the 2006 Chevrolet Trailblazer EXT, 2% of the 189 complaints for this model year. Where a mileage was given, the median is 61,000 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.

“I was driving home from work in my 2006 Trailblazer Ext. After stopping at the stop sign in front of my home, I pressed the center button on the overhead console to open the garage door and proceeded to turn right as to position the vehicle to allow for backing-up onto my driveway and into the right parking half of my garage. But as I shifted the trailblazer into reverse, I began to press the accelerator pedal, but the vehicle would not move. …”

NHTSA complaint #10416604, filed 2011-08, 73,162 miles

“The air conditioning on my 2006 chevy Trailblazer Ext stopped working. The problem was the blower motor resistor module and resistor module connector. The parts had melted together, causing the wires to become loose at the connection. Apparently this is a common problem with my chevy model. There are many online postings indicating that the problem could cause a fire. Chevrolet company refused to even look at my vehicle until I paid a $110.00 diagnostic fee. The service technician immediately knew what the problem was and explained that it was a common problem with my model and the tahoe. …”

NHTSA complaint #10329369, filed 2010-05, 50,000 miles

“Engine started knocking. Oil level was full. Towed to dealer. Dealer advised the main engine bearings went out. Dealer acknowledged no abuse or neglect. Gm will not replace motor. (2006 trailblazer).”

NHTSA complaint #10233607, filed 2008-07, 72,000 miles

“2006 Trailblazer Ext, 12/08 exiting freeway onto 50 MPH roadway and accelerating from stop sign at top of ramp, when engine lost power and slowed to a stop, with engine running and check engine light on, all at once. Almost broadsided on drivers door by approaching traffic.. Onstar said in was a throttle valve body issue and had it towed to dealer for night drop off. Next morning no code found, but they cleaned the throttle body valve assembly and linkage. No charge for diagnostics or cleaning! 4/21/09, 3000 miles later, the check engine light comes on with vehicle operating normally. …”

NHTSA complaint #10266523, filed 2009-04, 46,825 miles

Related service bulletins

Engine cooling: other model years

YearComplaintsShare of year
200642%
2004166%
2003165%
20021414%

Other parts of the 2006 Chevrolet Trailblazer EXT

Fuel system
129 complaintsElectrical system
41 complaintsExterior lighting
11 complaintsBody and structure
9 complaintsVisibility (wipers, defrost, mirrors)
8 complaintsTransmission and drivetrain
6 complaintsAir bags
4 complaintsOther or unknown
4 complaintsBrakes
3 complaintsTires
3 complaintsEngine
2 complaintsLatches, locks and linkages
2 complaints

← All problems reported for the 2006 Chevrolet Trailblazer EXT

About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Oct 28, 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