2008 Volvo S60 Owner's Manual - Page 175
2008 Volvo S60 Manual
Page 175 highlights
Normally, the coolant does not need to be changed. If the system must be drained, consult a trained and qualified Volvo service technician. NOTE Do not top off with water only. This reduces the rust-protective and antifreeze qualities of the coolant and has a lower boiling point. It can also cause damage to the cooling system if it should freeze. Top off with Volvo Genuine Coolant/Antifreeze only (a 50/50 mix of water and antifreeze) CAUTION The cooling system must always be kept filled to the correct level. If it is not kept filled, there can be high local temperatures in the engine which could result in damage. Different types of antifreeze/coolant may not be mixed. Check coolant regularly! WARNING Never remove the radiator cap while the engine is warm. Wait until the vehicle cools. If it is necessary to top up the coolant when the engine is warm, unscrew the expansion tank cap slowly so that the overpressure dissipates. 196 09 Maintenance and servicing Fluids Clutch and brake fluid reservoir