Volvo 164 1971, Instruction Book

Page: 44 / 65

i
Top-up with coolant
Top up with coolant by filling the ex-
pansion tank when its level has gone down
to the "Min" mark. Use 50% good quality
anti-freeze mixed with 50%
water all the
year round and top up to the "Max" mark.
NOTE. Do not top up with water only.
Water by itself reduces both the rust-pro-
tective 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 countries with very warm climate
where risk of frost is rare, ordinary water
can be used in the cooling system.
25 Change the coolant
The coolant retains its properties for
approx. 2 years when it should be changed.
A suitable time to make the change is dur-
i ng the autumn to ensure against any
damage by frost during the coming winter
months. To drain the cooling system, open
the drain tap located at the right-hand side
of the engine and disconnect the hose
attached to the bottom of the radiator.
The expansion tank is emptied by remov-
i ng it from its brackets and lifting it to a
sufficient height so that the coolant flows
i nto the radiator.
For cars fitted with an oil cooler for the
engine oil, the plug underneath at the back
of the oil cooler must be released.
SERVICING
Before filling with new coolant, flush the
entire system with clean water.
The cooling system is filled with coolant
through the filler opening on top of the
radiator. When this is being done, the
heater control should be set to max. heat
to ensure that the entire system will be
filled.
Fill the radiator to the top and fit on the
cap. Then fill the expansion tank to the
"Max" level or slightly above this.
Run the engine warm and then check that
the radiator is full and that the coolant in
the expansion tank is at "Max". If neces-
sary, top up the system.
43