If your engine dies every time you turn on the air conditioning (AC), there could be a few possible reasons for this issue:
Electrical Load: When you turn on the AC, it places an additional load on the engine's electrical system. If there is a problem with the electrical system, such as a weak battery or a faulty alternator, the added load from the AC may cause the engine to stall.
Idle Speed Control: Some vehicles have an idle speed control system that adjusts the engine's idle speed to compensate for the additional load when the AC is turned on. If this system is malfunctioning or not properly calibrated, it may not adjust the idle speed correctly, leading to stalling.
Compressor Issues: The AC compressor, which is responsible for compressing and circulating the refrigerant, may have a problem. If the compressor is seized or putting excessive strain on the engine, it can cause the engine to stall when the AC is engaged.
Engine Sensors: Modern vehicles rely on various sensors to monitor engine performance and adjust settings accordingly. If one of these sensors, such as the mass airflow sensor or throttle position sensor, is faulty or sending incorrect signals, it can disrupt the engine's operation when the AC is activated.
To diagnose the exact cause of the issue, it is recommended to have your vehicle inspected by a qualified mechanic. They will be able to perform diagnostic tests and identify the specific problem with your engine's stalling when the AC is turned on.