Sonata turns on the air conditioner nine times and sometimes turns off the engine.

It has something to do with idle motor or throttle. When the air conditioner is turned on, the computer will control the opening of the idle motor to become larger. If the idle motor is dirty or stuck, the stroke will be insufficient, resulting in too small air intake and the car stalling. Turning on the air conditioner and turning off the engine is related to engine load control. When the air conditioner is turned on, the engine computer will receive a signal that the load becomes larger and the throttle opening needs to be increased.