Volvo 1991 740 Model
Check coolant level
The cooling system must be filled with coolant and not leak to operate at maximum efficiency. Check the
coolant level regularly. 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
circulations between the engine tank during engine warm-up and cooling.
Changing coolant
Every two years or 30,000 miles (50,000 km) the cooling system should be drained, flushed and refilled.
Remove the expansion tank cap. Open the drain cocks on the right side 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. A 50/50 mix of water and
coolant should be used all 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.
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