1964-68 Ford Mustang Gen IV SureFit System The Gen IV™ climate control system now delivers Vintage Air's proven "just right temperatures" and dehumidified defrost to 1967-68 Mustang. The Gen IV™ uses an exclusive fully electronic microprocessor control system that requires no cables or vacuum connections. Separate high capacity copper parallel flow heat coil and aluminum plate and fin cooling coils provide outstanding performance and instant temperature adjustments. The Mustang system includes our exclusive Electronic Cable Converters™ which convert existing factory controls to electronic operation. 64-68 Mustang Gen IV System Infomation