Cadillac DeVille check coolant level warning persists despite adequate coolant level and no leaks on Cadillac DeVille

Some Cadillac DeVille owners report experiencing a persistent "check coolant level" warning despite having adequate coolant levels and no visible leaks. These warnings may be triggered by common sensor issues, including a stuck float or a faulty sensor. Additionally, some owners find that inspecting the surge tank and its sensor can help identify the cause of the warning message. Conducting a pressure test on the coolant system is also recommended to rule out any leaks or pressure issues. Properly bleeding the coolant system to remove air pockets may resolve sensor reading discrepancies. If the warning continues, it is advisable to seek a professional mechanic's inspection to uncover any underlying problems that might not be immediately visible.