- Connected a scan tool and found code P0128 – Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature). Inspected the engine coolant level and condition and found no faults. Ran the engine and used an infrared thermometer to measure the engine coolant temperature at the engine coolant thermostat housing inlet and outlet. The measured temperatures at the engine coolant thermostat housing inlet and outlet were identical but below the specified operating temperature, which indicated the engine coolant thermostat had opened. Removed the engine coolant thermostat and allowed it to reach room temperature, visually inspected the thermostat and found it was stuck in the open position. These test results verified the engine coolant thermostat was faulty.
- Courtesy Digital Vehicle Inspection, Customer concerns: 1st Time Vehicle
- THERMOSTAT & GASKET – Remove & Replace – DX,EX,GX,LX,Si
Monica M. gave our service a 5 star review on 5/20/2022