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While there are several potential causes for your Chevrolet Sonic heater not working properly, the three most common issues are a malfunctioning heater blower motor, a faulty thermostat, or a broken heater blower motor resistor. The heating system in your car is crucial for keeping you warm, comfortable, and safe during cold weather. It's important to note that the vehicle's engine cooling system plays a direct role in the operation of the heating system. The internal combustion engine generates heat through friction and combustion during operation. Opting to set the thermostat to 'Auto' has the advantage of maximizing energy efficiency, as the fan will only run when necessary. Additionally, with the thermostat set to 'Auto', the air filter will require less frequent cleaning or replacement.
I had to change out the blower motor and thermostat for my HVAC system.
The three most common reasons why your Chevy Sonic heater might not be working are a faulty heater blower motor, issues with the thermostat, or a malfunctioning heater blower motor resistor.