Why does my Ford Windstar lose power when AC is on?

Your Ford Windstar may lose power when the AC is on due to increased load on the engine, as the air conditioning compressor draws additional power. This can be more noticeable if the engine is not running optimally due to issues like a clogged air filter, weak spark plugs, or low coolant levels. Additionally, if the alternator is struggling to keep up with the demand, it could further exacerbate the power loss. Regular maintenance and checks can help identify and resolve these issues.