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 not exceed the MAX mark outside the expansion tank.
Important
- Harmful if ingested. May cause organ (kidney) damage.
- Use ready-mixed coolant as recommended by Volvo. If concentrated liquid is used, make sure that the ratio is 50 % coolant to 50 % water of an approved quality.
- Do not mix different coolants.
- Only new coolant should be used when replacing major cooling system components to ensure the system has sufficient corrosion protection.
- The engine must only be run with a well-filled cooling system. Otherwise, temperatures that are too high may occur resulting in the risk of damage (cracks) in the cylinder head.
- A high content of chlorine, chlorides and other salts may cause corrosion in the cooling system.