How to Add Coolant: Renault Megane (2002-2008) - 2003 Click to view0:25See how to add engine coolant (antifreeze) to a 2003 Renault Megane Authentique 1 4 Cyl. Turbo Diesel. This free video also shows you how to mix the coolant with water on a 2003 Renault Megane Authentique 1 4 Cyl. Author: Intl. Autos Replacing engine coolant - The Mégane II Owners' Club Halfords sell Advanced anti-freeze and coolant neat - it's basically ethylene glycol. Other places probably sell it cheaper, but at least the stuff they sell complies with Renault's standard (41-01-001). A 1.9 engine will need 6.8 litres from empty, but you will not drain it all out in the first place. What Type of Antifreeze & Coolant for Renault Megane. How Much Recommended antifreeze for radiators of Renault Megane. Find out how much coolant does your car need. Car A Rac presents recommended by manufacturers types for all popular vehicles. Renault Megane Coolant Temperature Sensors | MicksGarage Renault Megane Automobile engines use many simultaneously moving parts, each of which relies on another part of the engine. To keep everything running smoothly, engines use coolant and oil to stay properly cooled and lubricated. Coolant temperature sensors help maintain the temperature of your e..