Car Problem Reports

Chevrolet Trailblazer Faulty thermostat causing SES light to illuminate

Chevrolet Trailblazer Problem
8 Reports
Me Too

Model Years Affected: 2003, 2006, 2007

Engine Affected: 4.2L 6 Cylinder

Average Mileage: 131,165 mi (73,000 mi - 215,159 mi)

  • wwitt17092, , 4.2L 6 Cylinder, 84,000 mi

    This vehicle has a thermostat that fails in the open position which causes the temp gauge to drop below normal and heater to fail. The thermostat is located on the driver's side of the engine behind the alternator. You might need to remove the wheel to access the mounting bolts. You will need multiple rachet extensions and some patience. Dealer wants $500 to replace thermostat. Do it yourself for less than $100.

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  • Visitor, , 4.2L 6 Cylinder, 180,000 mi

    Ses light stays on. Had to replace multiple parts. Now it is the thermostat.

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  • Visitor, , 4.2L 6 Cylinder, 73,000 mi

    ought car used. When arrived home check engine light on. Check code- thermostat. replaced. no light or code

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  • Visitor, , 4.2L 6 Cylinder, 215,159 mi

    temp gauge read around 110 but the heat was hot . also check engine light was on

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  • Visitor, , 4.2L 6 Cylinder, 128,000 mi

    Had the same problem.

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  • Visitor, , 4.2L 6 Cylinder

    Check engine light came on. Had it checked and code came back to thermostat

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  • Visitor, , 4.2L 6 Cylinder, 105,000 mi

    service engine light came on. was told it could need engine coolant or was the thermostat. let problem go with out doing anything. bout a year later had to have a catalytic converter replaced. do not ignore engine lights. cost way more down the road

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  • justbeinghaley, , 4.2L 6 Cylinder, 133,000 mi

    I actually had my thermostat replaced after a faulty reading

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