How To Check The Coolant Level
The coolant level is checked at the expansion tank, always with a cold engine. A level that keeps dropping points to a leak.
DifficultyEasy
TimeAbout 5 minutes
AreaOil and fluids
What you need
- Owner’s manualShows the tank and the coolant type.
- Correct coolantOnly if you need to top up.
- ClothTo wipe the tank so you can see the marks.
Step by step
- Let the engine cool down completelyIdeally check before the first drive of the day.Never open the cap of a hot cooling system: hot coolant can spray out under pressure.
- Find the expansion tankA translucent plastic tank with MIN and MAX marks, usually near the side of the engine bay.
- Read the level from outsideThe coolant should be between the marks. You do not need to open the cap to check.
- Top up if neededOpen the cap slowly when cold and add the coolant type your manual specifies, up to the MAX mark.
- Close the cap tightlyA loose cap lets coolant boil off.
- Watch the level over the next daysIf it drops again, there is a leak or a consumption problem.
When to go to a workshop
Go to a workshop if the level keeps falling, if you see white smoke, bubbles in the tank or milky oil, or if the temperature gauge rises above normal.
If the temperature warning light comes on while driving, stop safely and switch off the engine.
Questions about How To Check The Coolant Level
Can I top up with water?
In an emergency, clean water is better than nothing, but it dilutes antifreeze and corrosion protection. Have the mixture checked afterwards.
Does the coolant colour matter?
Colour alone is not reliable. Use the specification in the manual and avoid mixing types without checking compatibility.