Here's why:
* Increased load: The AC compressor is a significant power consumer. The engine has to work harder to power the compressor, especially at idle or low speeds. This added strain generates more heat within the engine.
* Existing issues: If your car already has cooling system problems (low coolant, faulty water pump, clogged radiator, etc.), the added load from the AC can push the system over the edge and cause overheating. A healthy cooling system can typically handle the extra load.
* Traffic/Low speeds: When you're stuck in traffic or driving at low speeds, the engine doesn't have as much airflow to cool itself naturally. The AC compressor's added load exacerbates this problem, making overheating more likely.
In short: The AC itself doesn't *cause* overheating, but it increases the demand on the engine's cooling system. If the cooling system is functioning properly and the vehicle isn't subjected to prolonged periods of idling or low-speed driving in extreme heat, it's unlikely to cause an overheating problem. However, if you have any concerns about your car's cooling system, have it inspected by a mechanic.
