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2003 Chevrolet Trailblazer Replace the thermostat

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Filed Under (Chevrolet) by admin on 10-06-2010

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Tests/Procedures: 1. Replace the thermostat and test drive to see if the code returns. Potential Causes: Thermostat Tech Tips: This code indicates the engine has not reached a set temperature based on engine run time. Diagnostic Codes: P0128 43 – Engine Thermostat 3 – Engine Thermostat, Thermostat Housing 2 – Thermostat Housing 1 – Engine Coolant, Engine Thermostat 1 – Engine Coolant 1 – Engine Coolant Temperature (ECT) Sensor, Engine Thermostat

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