If there is coolant under the car, if there is coolant smoke, or if more than 2 litres (approx. 2 quarts) have been filled, always call for recovery to avoid the risk of engine damage due to a defective cooling system when attempting to start the car.
Warning
The coolant may be very hot. Never open the cap when the coolant is hot. If a top-up is required, unscrew the expansion tank cap slowly to allow any overpressure to disappear.
![P6-1746-XC40-Refill engine coolant](https://www.volvocars.com/images/support/imgab5b81f61dd86ce9c0a801522e636e41_2_--_--_VOICEpnghigh.png?imwidth=1280)
Screw off the cap and top up with coolant if necessary. The coolant level must lie between the MIN and MAX marks on the expansion tank.
Important
- Coolant is harmful to ingest and may cause organ damage.
- Only use coolant of Volvo-approved quality. If concentrated liquid is used, make sure that the ratio is 50 % coolant to 50 % water of approved quality.
- Hard water, and water with a high content of chlorine, chlorides and other salts or contaminants may cause corrosion to the cooling system.
- Do not mix different coolants.
- New coolant must be used to replace all coolant when replacing a larger component in the cooling system.
- Only operate the engine when the cooling system is filled to the correct level. When the coolant level is too low, it may lead to overheating, resulting in engine damage.