Procedure In Cold Weather; Engine Cooling System - Volvo 121 Servicing

SERVICING

Procedure in cold weather

When cold weather is in the offing,
it is time to think of the winter
servicing of your vehicle. The first
heavy night frosts can come as an
unpleasant surprise unless preventive
precautions have been taken.

Engine cooling system

Genuine Volvo coolant should be used all the year round. Therefore the
coolant should not comprise only of water plus a rust-proofing agent,
not even during the summertime.
The coolant retains its properties for about 1 year, when it should be
changed. A suitable time for doing this is during the autumn, as maxi-
mum security against possible damage by frost during the winter months.
When changing the coolant, flush the cooling system with clean water.
Otherwise, see page 40. If the coolant has to be topped up during the
winter, use only genuine coolant. Water alone weakens both the anti-rust
properties of the coolant as well as its rust-proofing effectiveness. When
topping up with coolant, it is a good idea to check the concentration to
ensure that it is strong enough to provide sufficient protection against
damage by frost.
Experience has shown that too thin glycol mixtures (10-20 %) are
extremely unfavourable from the viewpoint of rust protection. The
amount of glycol added should be at least 40 °/o, that is 3.4 litres
(6 Imp. pints = 7
°
( -12 F).
Radiator alcohol is not recommended as an anti-freeze agent because
it has the disadvantage of evaporating at normal engine temperature.
Drain cocks for cooling system
1. Right side of radiator.
5 2
/4
1
US pints), which is effective below -24
2. Right side of engine.
°
C