Chevrolet Volt heat not working in electric mode, functions with gas engine on Chevrolet Volt

Some Chevrolet Volt owners report experiencing issues with the heat not functioning in electric mode while it operates normally with the gas engine. This problem may be linked to a faulty high voltage heater system that requires diagnostics to determine the specific issue. Additionally, some owners have noted that a malfunctioning valve or a problem with the temperature door could be the cause, particularly if they hear sounds resembling boiling water and experience limited heat output. The heater mechanism in the Chevrolet Volt is complex, involving electrical, mechanical, and coolant systems, which means a technician's evaluation is often necessary to accurately diagnose the problem based on the symptoms reported. It is advisable for owners facing this issue to seek inspection from a qualified technician to identify and resolve the underlying cause.