Volvo 780 Owner's Manual page 100

1987 Volvo 780
Check coolant level
The coolant system must be filled with coolant and not leak to operate at maximum efficiency. Check the coolant level when filling fuel.
The level should be between the "MAX" And "MIN" marks on the expansion tank. The check should be made with particular thoroughness
when the engine is new or when the cooling system has been drained. Do not remove the filler cap other than for topping-up with coolant.
Frequent removal may prevent coolant circulation between the engine and the expansion tank during engine warm-up and cooling.
Changing coolant
Every two years or 30,000 miles (48,000 km) the cooling system should be drained, flushed and refilled.
Remove the expansion tank cap. Open the drain cocks on both sides of the engine block and disconnect the lower radiator hose.
Fill coolant through the expansion tank. The heater controls should be fully open when draining and filling.
Add coolant until the level is up to the MAX mark or slightly above.
Start the engine and run until hot. Check the cooling system connections for tightness. Also re-check the coolant level.
Capacity: See "Specifications"
Coolant: Volvo Coolant Type C (blue green)
CAUTION
The cooling system must always be kept filled to correct level. If it is not kept filled, there can be high local temperatures in the engine
which could result in damage.
Top up with coolant
Top up with coolant by filling the expansion tank when level is at the "Min" mark. Use a mixture of 50 percent anti-freeze/summer coolant
and 50 percent water all the year round. Top up to the "Max" mark.
WARNING!
If the engine is warm and you are going to top up coolant, unscrew the cap slowly in order to allow any excess pressure to
escape.
NOTE: Do not top up with water only. Water by itself reduces the rust-protective and anti-freeze qualities of the coolant and has a lower
boiling point. It can also cause damage to the cooling system if it should freeze.
pg. 102 Lubrication
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