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. Note: The coolant should be changed when the cooling system is cleaned: every 6,000 hours or at least every 5 years. See Changing the coolant and cleaning the cooling system.
0 10 0 20 30 40 50 % -20 -16 -10 The coolant has several characteristics which are important for the operation of the cooling sys- tem: -30 Corrosion protection Frost protection Increases the boiling point -40 -50 312 505 °C B A Scania recommends that the coolant used is a mixture of water with antifreeze and corrosion protection (ethylene glycol). The coolant should always contain 35-55% by volume of antifreeze and corrosion inhibitor so that the coolant has the correct properties for the cooling system to work. The chart depicts coolant properties at different percents of antifreeze and corrosion inhibitor concentration by volume. 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: There is risk of damage by freezing 00:23-02 en-GB 20 © Scania CV AB 2016, Sweden 1 3 2