Car Problem Reports
Chevrolet Trailblazer Faulty thermostat causing SES light to illuminate
Chevrolet Trailblazer Problem
Engine Affected: 4.2L 6 Cylinder
Average Mileage: 133,031 mi (84,000 mi - 215,159 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.
Visitor, 2003 Chevrolet Trailblazer, 4.2L 6 Cylinder, 215,159 mi
temp gauge read around 110 but the heat was hot . also check engine light was on
Visitor, 2007 Chevrolet Trailblazer, 4.2L 6 Cylinder, 128,000 mi
Had the same problem.
Visitor, 2007 Chevrolet Trailblazer, 4.2L 6 Cylinder
Check engine light came on. Had it checked and code came back to thermostat
Visitor, 2003 Chevrolet Trailblazer, 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
I actually had my thermostat replaced after a faulty reading