The contact owns a 2023 Subaru Solterra. The contact stated while driving at an undisclosed speed, the heating system became inoperable. The contact stated that the heating system failed to function properly and was blowing out cold air instead of heat. The vehicle was taken to the dealer and the failure was duplicated by the dealer; however, the dealer was unable to retrieve a fault code. The vehicle was not diagnosed or repaired. The manufacturer was made aware of the failure. The failure mileage was approximately 16,000.