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The thermostat in the 2012 Buick LaCrosse is located within the thermostat housing along the lower coolant line. It is responsible for monitoring the temperature of the coolant circulating through the line to determine the engine's operating temperature. If the thermostat malfunctions, the engine can overheat, leading to potentially costly damage such as warping or cracking of the head gasket. If the check engine light indicates a faulty thermostat, it is crucial to address the issue promptly to avoid further damage. A full replacement costs around $200, so it's best not to delay the repair.
The thermostat on a 2012 Buick Lacrosse can be found along the top coolant line.
On the engine's starboard side within the engine bay.