Volvo D11F Operator's Manual And Maintenance Instructions page 49

In addition to this, the coolant must:
Protect against pitting and cavitation erosion damage of the water pump
and cylinder liners.
Protect against freezing and boiling.
Prevent formation of scale, sludge deposits and clogging.
Be harmless to polymer materials and seals in the cooling system.
Maintain its liquid properties in cold climates.
Many engine failures can be traced back to a problem in the cooling system. If
the coolant level is allowed to go below the bottom of the tank, there is the risk
of the engine shutting down. See the operator's manual for more information
on the warning functions.
Always dispose of coolant according to Federal or local regulations. Take all
used coolant to a recycling or waste collection center.
Coolant mixture consisting of an antifreeze solution in water should be used
year-round to provide freeze and boil-over protection as well as providing a
stable environment for seals and hoses.
Maintenance and Service 45