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54 Car care
and
scheduled maintenance
Filling
1. Close the drain cock
and
plug
and
ensure
that the heater
control
is
set
to max-
imum heat.
2. Fill
the system
with
coolant
until the
expansion tank is filled.
3. Open the bleeder nipple on the thermos-
tat housing,
allow the
coolant to flow
out of the nipple until free from
air
bub-
bles.
4. Close the bleeder nipple, top up the
expansion
tank
if necessary
and
replace
cap.
Anti-freeze
coolant
mixtures
The
cooling system
is
factory
filled with
a
mixture of
ethylene glycol and
water (50-
50
mix). For maximum
security against
fre-
ezing
and
corrosion the
glycol
should
be
50-
70%
ofthe mixture. Always use
Saab
brand
anti-freeze,
which
is
suitable
for
engines
with
aluminum alloy cylinder
heads, and
mix with clean fresh water (see below).
To
prevent freezing in
the
cold
season
and
reduce the risk
of
boiling over in hot
wea-
ther, never use
pure water
in the cooling
system.
Pure water is
also
undesirable as it
affords no
corrosion
protection.
The factory fill
coolant
must be
changed
and the
system
flushed
according
to the
maintenance
schedule as
the important
corrosion inhibitors
and
other coolant
addi-
tives lose
their effectiveness
with time and
use. Without adequate
corrosion
protec-
tion, serious damage may occur
to
the
cylinder head
and
other components in
contact
with the coolant.
Corrosion
protec-
tion may be depleted
even
though
the
coo-
lant
gives adequate
anti-freeze protection
and
has an acceptable (alkaline) pH level
of
7.5-11. When preparing a new coolant
solu-
tion, mix the
recommended ethylene glycol
with water low in
corrosive
irons
such as
chlorides
and
sulfates.
Avoid
hard
water
which
can
cause clogging in the
radiator.
Do not use coolant booster
additives.
Keep
the
cooling
system full
and
free
of air
pock-
ets and
foaming
.
Saab brand
coolant (BASF G-105)
meets
Factory
recommendations
and is
available
at Saab dealers.
NOTE! When
topping
up the
system,
premix the
ethylene glycol
with
a
suita-
ble quantity
of
water. As full circulation
cannot
take place until the thermostat
opens,
there is
still a
risk
of the engine
being damaged by ice if the
glycol and
water were
added separately
and
did not
mix quickly
enough.
Thermostat
A special
3-way thermostat
is used.
Ope-
ning temperature specifications
are
as fol-
lows:
Naturally
aspirated
engines-
Standard, 88°C
Hot weather
alternate, 82°C
Extreme
cold weather, 92°C
(Do
not use in
Turbo engines)
Turbocharged engines-
Standard,82°C
Extreme
cold weather, 88°C
Brakes
The footbrake
system
is power-assisted,
with
the result that the force
applied
to the
brake pedal is amplified on braking. Howe-
ver,
this
additional power is
only
available
when the
engine
is
running.
Much
greater
pressure on the
brake
pedal
will be needed
to brake the
car
when the
engine
is
swit-
ched off.
There
are
two warning lights
on
the instru-
ment panel, one for the handbrake
and
one
- Quick Links:
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- Saab-Guard Alarm
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