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The 2014 Chevy Sonic has a thermostat located in the thermostat housing on the lower coolant line. The thermostat is responsible for monitoring the temperature of the coolant flowing through the line, allowing it to determine the engine's operating temperature. If the thermostat malfunctions, the engine may overheat, which can cause significant damage to the car. Engine overheating can lead to potential warping or cracking of the head gasket, resulting in costly repairs in the future. If the check engine light indicates an issue with the thermostat, it is crucial to address it promptly. A complete replacement typically costs around $200, so delaying the repair is not recommended.
This can be found in the rear left of the hood, on the left side. Keep an eye out for a tiny black box.