Scion FR-S low rattle noise when air conditioning is on on Scion FR-S

Some Scion FR-S owners report experiencing a low rattle noise when the air conditioning is turned on, which may indicate a minor problem or signal a larger issue to come. Commonly reported problems with the air conditioning system include rattling noises that could be directly related to the air conditioner itself. Additionally, some owners have noted very loud rattling upon start-up, particularly when the catalytic converter is warmed up. The rattling noise tends to be more pronounced with the air conditioning on due to the added strain on the system. It is crucial for owners to check for potential issues such as low refrigerant levels, which can lead to freezing and visible white lines on components near the engine radiator. To resolve these concerns, it is advisable to have a mechanic inspect the air conditioning system, check refrigerant levels, identify any leaks, and test the system components to determine the source of the noise.