Volvo 164 Owner's Manual - page 50
SERVICING
25 Check the coolant level
The cooling system must be well filled with
coolant and not leak if it is to operate at
maximum efficiency. Check the coolant
l evel when filling up with fuel. The level
should be between the "Max" and "Min"
marks on the expansion tank. The check
should be carried out with particular thor-
oughness when the engine is new or the
cooling system has been empty.
Do not remove the filler cap other than for
topping-up
with
coolant.
Frequent re-
moval may prevent coolant circulation be-
tween the engine and the expansion tank
during engine warming up and cooling.
Topping up with coolant
Top up with coolant by filling the expan-
sion tank when its level has gone down to
the "Min" mark. Use all the year round a
mixture of 50 % reliable anti-freeze and
50 % water. Top up to the "Max" mark.
NOTE. Do not top up with water only, parti-
cularly during the wintertime. Water by it-
self reduces both the rust-protective and
anti-freeze qualities of the coolant. It can
also cause damage to the cooling system
if ice should form in the expansion tank.
NOTE. In very warm parts of the country
where there is little risk of frost, water can
be used without anti-freeze.
26 Changing the coolant
The coolant retains its properties for ap-
prox. 2 years when it should be changed.
A suitable time to do this would be in the
autumn to preclude any damage by frost
during the coming winter. To drain the
cooling system, unscrew the drain plug
l ocated on the right-hand side of the en-
gine and disconnect the hose connected
to the bottom of the radiator. On the B30E
the drain cock is located on the oil cooler.
The expansion tank is emptied by remov-
i ng it from its brackets and lifting it to a
sufficient height so that the coolant can
flow into the radiator.
Before filling with new coolant, flush the
entire system with clean water.
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