Mini Cooper acceleration hesitation and fan running after engine shutdown on Mini Cooper

Some Mini Cooper owners report experiencing acceleration hesitation, which may be caused by a faulty mass air flow sensor that regulates airflow and fuel injection. Additionally, some owners notice the cooling fan running after the engine is turned off, potentially indicating issues with the auxiliary water pump or other cooling system components. This continuous operation of the fan can lead to starting problems, where the vehicle may turn over but not start until the fan is shut off and the engine is restarted with gas. Notably, acceleration hesitation can occur without triggering an engine warning light, underscoring the need for diagnosis even when no indicators are present. Troubleshooting these issues often involves checking the mass air flow sensor, cooling system, and related components. It is recommended that affected owners consult a professional mechanic for a thorough inspection and resolution of these concerns.