The Citroen DS cooling system is somewhat unique in that it relies almost exclusively on pulling air through ducting to cool the radiator. Most cars have a grille where the faster the car moves, the more air is pushed over the radiator. On modern cars this is the grille below the bumper. It is only at idle they only rely on pulling air through the radiator. The Citroen DS has a large plastic fan attached to the camshaft pulley. That fan sits behind the radiator and then pulls air through based on engine speed. The DS21ie and all DS 23 […]