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.
![P5-1617-XC90/XC90H Overview engine coolant](https://www.volvocars.com/images/support/imgfa7a0cfc45eda4abc0a8015276f08dee_1_--_--_VOICEpnghigh.png?imwidth=1280)
![P5-1519 Engine coolant refill 1](https://www.volvocars.com/images/support/imgba9e39b315231aa5c0a8015275bbd1e3_2_--_--_VOICEpnghigh.png?imwidth=1280)
![P5-1519 Engine coolant refill 2](https://www.volvocars.com/images/support/img94ef2813152c2c07c0a801523a587b0f_1_--_--_VOICEpnghigh.png?imwidth=1280)
![P5-1519 Engine coolant refill 3](https://www.volvocars.com/images/support/imge619da8d15354e32c0a8015252851720_1_--_--_VOICEpnghigh.png?imwidth=1280)
![P5-Icon gray box 1](https://www.volvocars.com/images/support/imgc457d9ab665e93b5c0a801524f9fdc84_1_--_--_VOICEpnghigh.png?imwidth=1280)
Lift off the rubber strip by pressing it inward in the engine compartment.
![P5-Icon gray box 2](https://www.volvocars.com/images/support/img788513ba665e4b01c0a801521b297a3f_1_--_--_VOICEpnghigh.png?imwidth=1280)
Detach the flap in the plastic cover by folding out the release catch and turning the flap upward.
![P5-Icon gray box 3](https://www.volvocars.com/images/support/img7f12be10665e0337c0a8015243da4a10_1_--_--_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
- 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.