The fan spacer for the Citroen 11CV is a crucial component that positions the fan at the correct distance from the radiator. This ensures optimal airflow and cooling, which is vital for the engine's performance and longevity. The spacer is typically made from durable metal or high-quality plastic to withstand heat and vibrations. Proper installation of the spacer prevents the fan blades from damaging the radiator, maintaining efficient operation. It is an indispensable part for enthusiasts who want to keep their classic Citroen in top condition.