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Engine coolingPart report

2006 Toyota Highlander Engine cooling Problems

Complaints
21about this part
Share
8%of 278 total for the year
Median mileage
67,400miles
Trend
StableComplaints filed in the last 3 full calendar years are within 25% of the 3 years before.

NHTSA recorded 21 complaints about the engine cooling of the 2006 Toyota Highlander, 8% of the 278 complaints for this model year. Where a mileage was given, the median is 67,400 miles. 1 a fire, according to the filers.

Example complaints

Selected from NHTSA records; personal details are removed. They are consumer reports, not findings.

“From a parked position, I started engine on 2006 Toyota Highlander. The car moved forward for a few seconds at slow speed, then very rapidly accelerated so that I could not stop the car. Serious injuries occurred. Car flew through air and onlookers heard engine rev up.we landed in a water canal.”

NHTSA complaint #10262208, filed 2009-03, 38,000 miles

“I purchased a used 2006 Toyota Highlander from a fernelius dealership in michigan in april 2011 - it was in mint condition with 56210 miles on it - thought I had made the best deal ever - then the day before thanksgiving while driving it overheated. Thought I had blown a head gasket only to find out that the thread bolts on the short block had stripped out and leaked radiator fluid everywhere causing it to overheat. At that time the mechanic told me that I needed a new engine. …”

NHTSA complaint #10443954, filed 2012-01, 67,996 miles

“While attempting to pass a vehicle on interstate 85 nb, my Toyota certified pre-owned 2006 Highlander hybrid completely shutdown resulting in the loss of power steering, power braking, and all engine power. I was able to maintain control of my vehicle despite the failure and coast to the shoulder of the highway from an initial speed of approximately 70 MPH. My vehicle was towed to my local Toyota dealership where I was informed that my power inverter had failed and would subsequently need to be replaced. …”

NHTSA complaint #10340769, filed 2010-06, 67,400 miles

“When I use the A/C and turn it off a bad odor comes from the vent . This is a new 2006 Highlander, the next day I brought it to the dealer he said take for service , they told me to drive it for a few more days . I put 1500 miles and the odor is still there . I took it for service again . The mechanic said to use a deodorizer on the vent. I am not a satisfied customer. I want this issue resolved. I paid for the Highlander not the smell that came with it.”

NHTSA complaint #10158668, filed 2006-05, 5 miles

“My wife was driving our 2006 Toyota Highlander. She drove approx 1/2 mile from our house at an average speed of 35 MPH when the temperature gauge suddenly went past the red line. We had our car towed to crown Toyota where they tore down the engine and found water pump leaking and head gasket leaking oil . They removed engine head and found warped block and but head was okay. We then towed the Highlander to a private mechanic to have block replaced and we were informed the block was not warped but instead the bolts on the engine are stripped/defected. …”

NHTSA complaint #10407053, filed 2011-06, 68,970 miles

Related service bulletins

Engine cooling: other model years

YearComplaintsShare of year
2025110%
201931%
201731%
201611%
201521%
201331%
201221%
201153%
201021%
200954%
2008184%
200722%
2006218%
200584%
2004207%
20034618%
2002238%
20011712%

Other parts of the 2006 Toyota Highlander

Brakes
102 complaints
Vehicle speed control
43 complaints
Electrical system
26 complaints
Visibility (wipers, defrost, mirrors)
24 complaints
Transmission and drivetrain
22 complaints
Engine
19 complaints
Steering
16 complaints
Air bags
12 complaints
Electronic stability control
12 complaints
Fuel system
12 complaints
Other or unknown
10 complaints
Exterior lighting
7 complaints

← All problems reported for the 2006 Toyota Highlander

About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Oct 27, 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