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Fig. 2-93.
Coo lont
flow,
thermostat open
Concerning
numbers ab
ove,
see
previous figur
e
VO
LVO
103309
(oo lant f lows from the engine into the upper part
of
the rad
iat or,
is cooled and t hen sucked by the
pu mp
out
from th
e
low
er pa;rt of the rad iator fro
m
where
i·t
is
convey ed into th
e
engin
e
through the
d istributink
pipe.
An air cush
ion
f.orms
in the
upper part of ,the ex-
pansion tank
and perm
its
the ,coolant to expand
without involving
any
loss
of coo lant so that there
is
a,ir suotion
at
r.ed uced
temperature and volume. This
arrangemenif
ens ures
that the
coo,
l ing
system
is
al
-
ways fil l,ed with
'
o oolant,
th-us minimizing t.he
risk of
cOf1ros
ion
.
When the
cooling system
is be,ing
topped
up,
it
will
probably be diffi·cuH
to
prevent air from
entering this system. The air,
however,
is
subsequently
separat·ed and forced out
into
the expansion tank
where
it is rep laced by coolant from thi
s
tank.
It is,
therefof1e, import.ant
to check the coolant
level
after
the
system
has
been emptied and f
ill
ed with new
cool·ant.
The
expansion tank cap is provided
with
a va lve
which open when
the pressure
in
the system goes
up
to
.7
a:tmosph
e6c
gaug,e.
There
is
a lso a va·lve
which
opens when there is
apartial vacuum
in
the system
and
admits
a ir
into the
expans
ion
tank.
REPAI R I NSTRUCTIONS
TOPPING UP WITH
COOLANT
Topping up
wi,
t h
coolant,
consisting of
50
%
glycol
and 50
%
water (all year round) .is done in th
e
ex-
pansion tank, when the lev·el has
fallen
to the
"Min"
ma1
rk.
N
.B.
Never top up with water
only.
DRAINING THE COOLlNG
SYSTEM
To dra,n rthe coo·ling system, open a
cock
on the
en-
g'ine and remove thelower radiator hose.
The expan-
sion tank ,is
l
e mptied by first taking
:i,
t off its mounting
anld holding it
ot
a sufficient height
tha,
t the
coolont
runs into the radiator. Another way to
empty the
tank is by
Iturning
it upside down.
2:
42
FILLlNG EMPTY SYSTEM WITH COOLANT
Before fi.Hing,
flu'
s
h
the cooling
system
with
clean
water.
When
filling with
coo
lant,
through the filler
op,ening
on top of
\the
radtatof, the
heater
c.onkol
should be
set aif
max. heat. Fil,1
the radiator to
the
top
and
fi,
t
I
t hecap. FiH also
the expansion
tank to
the "Max" mark
or
to
max.
30 mm
(1/8/1)
above Ithis
marie Run
the engine f.or sevelral minu!es at different
speeds.
If necessary,
top
up with
more coolant and
then
fit .the
expansi'on
,
t ank cap. After driving for a
short .time, check
the
coolant
leve·1
and top
up
with
more
cool·ant since
it
takes some time before
the
system
is cOlmpl,etely
devo'i·d of
a,ir.
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