Check the coolant level at regular intervals after about 4 weeks. To top up, use a mixture of antifreeze and lime-free water.
On a cold engine (coolant temperature approx. 20°C) The coolant level in the expansion tank must be between the FULL and LOW marks.
If the fluid level on a cold engine is close to the LOW mark, add coolant.
Pour cold coolant only into a cold engine to avoid damage.
If there is a noticeable drop in the fluid level, visually inspect and find leaks.