Cooling system Cooling system Coolant resistance to cold The following example shows coolant properties with 30 percent by volume of antifreeze and cor- rosion inhibitor: Coolant WARNING! Ice slush starts to form at -16°C (3°F). At -30°C (-22°F), there is a risk of cooling system malfunction. There is no risk of damage by freezing with a minimum antifreeze and corrosion inhibitor content of 35 percent by volume. Ethylene glycol can be fatal if ingested and can cause skin irritation and eye damage. The coolant recommended by Scania is a mix- ture of water with antifreeze and corrosion inhib- itor (ethylene glycol).
The coolant has several characteristics which are important for the oper- ation of the cooling system: The chart depicts coolant properties at different percents of antifreeze and corrosion inhibitor concentration by volume. Corrosion inhibitor Antifreeze Increases the boiling point 0 10 0 20 30 40 50 % -20 -16 -10 The coolant should always contain 35-55% by volume of antifreeze and corrosion inhibitor so that the coolant properties ensure that the coolant works correctly. -30 -40 Note: The coolant should be changed when the cooling system is cleaned: every 6,000 hours or at least every 5 years. Refer to Changing coolant. -50 312 505 °C B A Curve A: Ice formation starts (ice slush) Curve B:
Damage by freezing occurs Area 1: Safe area Area 2: Malfunctions may occur (ice slush) Area 3: Risk of damage by freezing OPM 300 en-GB 46 © Scania CV AB 2015, Sweden 1 3 2