Checking coolant level Citroen C1 (2005 - 2014) | Haynes Home | placeholder | Checking coolant level Citroen C1 (2005 - 2014) Citroen C1. 2005 - 2014 . Checking coolant level. Time. 1 minute. Difficulty. Haynes can help you complete this job on your Citroen C1. The complete guide to repairs, service and maintenance for this vehicle is available from Haynes in print, online and video formats. Select What Type of Antifreeze & Coolant for Citroen C1. How Much Recommended antifreeze for radiators of Citroen C1. Find out how much coolant does your car need. Car A Rac presents recommended by manufacturers types for all popular vehicles.