Does Turning on the AC While Igniting Harm the Engine?

[DelMadeline]

It falls under idling with the AC on and will not harm the engine. This is because the engine, alternator, and compressor are all operating normally, causing minimal damage to the vehicle. Below are relevant explanations: 1. Turn on the external circulation after rainy days: This prevents water vapor caused by temperature differences, which can lead to mold growth in the AC evaporator and pipes. After rainy days, turn on the AC on sunny days to keep it dry. Prolonged rainy weather significantly affects the AC, so after sunny days, activate the external circulation and turn on the blower to dry it out, keeping the AC dry and preventing mold. Occasionally run the AC at high fan speed. 2. Maintain the cleanliness of the AC system: If the AC is unused for a long time, dirt or dust can accumulate in the AC ducts, leading to mold over time. This not only causes odors in the vehicle but also releases harmful air. Therefore, frequently running the AC helps maintain the cleanliness of the system.