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- Fig. 309 Engine compartment: Markings on coolant expansion tank
Please refer to the safety notes link►.
Checking coolant level
Park the vehicle on a level surface.
Switch off the ignition.
Read off the coolant level on the coolant expansion tank Fig. 309►. When the engine is cold, the coolant level should be between the marks. When the engine is warm, it may be slightly above the top mark.
Topping up coolant
(Applies to vehicles with plug-in hybrid drive) : Your vehicle has two separate coolant expansion tanks. The smaller of the two expansion tanks must not be opened link►. Please refer to the important safety notes ►.
Important: The coolant expansion tank must not be empty ►.
Wait for the engine to cool down.
Cover the cap on the expansion tank with a cloth, and carefully unscrew the cap anti-clockwise ►.
Add coolant in the correct concentration link► up to the top mark.
You should make sure that the fluid level remains stable. If necessary, add more coolant.
Screw the cap on again tightly.
Any loss of coolant normally indicates a leak in the cooling system. Drive to a qualified workshop without delay and have the cooling system checked. If there are no leaks in the system, a loss of coolant can only occur if the coolant boils and is forced out of the system as a result of overheating.
- The cooling system is under pressure. Do not unscrew the cap on the expansion tank when the engine is hot: you could be scalded by escaping steam.
- The coolant and coolant additive can be a health hazard. Store the coolant additive in the original container in a safe place out of reach of children – risk of poisoning.
- When working in the engine compartment be aware that the radiator fan may start running suddenly, even if the ignition is switched off – risk of injury!