Cooling System; Check Coolant Level; Changing Coolant - Volvo 740 GL Owner's Manual

1985 Volvo 740 GL, GLE, Turbo
pg. 103 Cooling system

Check coolant level

The cooling 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 (50,000 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 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 temperature in the engine which could result in damage.
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