Chevrolet Trailblazer Problem Report

Chevrolet Trailblazer Faulty thermostat causing SES light to illuminate

(9 reports)
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. -
Ses light stays on. Had to replace multiple parts. Now it is the thermostat. -
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 -
Replaced thermostat twice, dealer said it needed to be changed again or maybe it's just a bad sensor :-( -
ought car used. When arrived home check engine light on. Check code- thermostat. replaced. no light or code -
temp gauge read around 110 but the heat was hot . also check engine light was on -
Had the same problem. -
Check engine light came on. Had it checked and code came back to thermostat -
I actually had my thermostat replaced after a faulty reading -
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