Chevrolet Sonic thermostat housing malfunction causing overheating and head gasket failure after incomplete initial repair on Chevrolet Sonic

Some Chevrolet Sonic owners report experiencing overheating due to a malfunctioning thermostat housing, which can prevent the cooling fan from operating unless the AC is set to maximum. This issue may persist even after a thermostat housing replacement, indicating that the initial repair was not fully effective. Ignoring engine overheating can lead to severe consequences, including head gasket failure, which is critical for sealing combustion chambers and coolant passages. A blown head gasket can result in coolant leaks, further overheating, and significant engine damage, making repairs more costly. It is essential for owners to address thermostat housing malfunctions promptly to avoid these serious complications.