Coolant Flush How-to: Citroen C3 Picasso (2009-2017 Adding engine coolant (also known as antifreeze) to your 2011 Citroen C3 Picasso is pretty easy. Engine coolant circulates through your engine to keep it cool in the summer but won't freeze in the winter. Make sure to check your engine when it is cold for an accurate reading. Type of Antifreeze for Citroen Xsara Picasso. How Much Do Recommended antifreeze for radiators of Citroen Xsara Picasso. Find out how much coolant does your car need. Car A Rac presents recommended by manufacturers types for all popular vehicles.