CUSTOMER CONCERN The A/C cools in electric operation but blows warm when the gasoline engine starts; DTC B1441 is stored and the air-mix door does not respond. CAUSE The air-mix actuator harness circuit board passed an input frequency signal but produced no corresponding output; the actuator was also replaced because an internal short may have damaged the circuit. CORRECTION Remove and replace the air-mix damper actuator and its control wiring harness, clear B1441, and verify