Does the Engine Start-Stop System Affect the Air Conditioning?
2 Answers
The start-stop system has minimal impact on the air conditioning compressor. The engine auto start-stop system primarily operates as a hot start and determines activation based on factors such as battery status and vehicle electrical system load. The engine shuts off to save fuel without compromising the comfort and safety functions of the vehicle's electrical systems. Additional Information: During scenarios like waiting at traffic lights or in congested roads, the intervals between stopping and starting are limited, so the impact on electrical systems, including the air conditioning, is relatively minor. How the Air Conditioning Compressor Works: In actual operation, it repeatedly starts and stops. When the cabin temperature drops, it automatically stops, and when it gets warm, it re-engages. It uses an electromagnetic clutch, which is not prone to damage.
I've been driving a car with auto start-stop for several years and have indeed noticed that the air conditioning weakens or even shuts off at red lights. This happens mainly because when the engine stops, the AC compressor stops running, leaving only the blower to circulate natural air. However, the car is quite smart—during hot summer days, it prioritizes cooling. I've observed on the dashboard that if the interior temperature is significantly higher than the set value, the start-stop function automatically pauses. The impact is smaller in winter since the heating relies on residual engine heat, which can maintain warmth for a while after the engine shuts off. I recommend setting the AC to recirculation mode, as this slows the loss of cool air and makes the start-stop experience more comfortable.
