Porsche 944 S2 Owner's Manual page 64

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To
avoid damage
to
the
engine,
only
add
cold anllfreeze and cold water to the cool-
ing
system
when the engine is also cold.
A warm engine should only be topped up
if
the coolant level
has
dropped
appreciably
below
the minimum
mark.
Too
much added
coolant
will
escape
through the
pressure
cap
when coolant
warms up.
lf more than about 'l.06
U.S.
qt or
1
liter
must
be added,
the cooling system should
be
bled
by an
authorized Porsche dealer.
Wlnter operalion
At the beginning of the winter season, have
the coolant
checked
lor
anti-freeze concen-
tration.
The ratio
between
water and
anli-freeze
necessary
to
prevent freezing
depends
on
the
anticipated outside temperatures. The
ratios can be taken
lrom the mixing
chart
listed under "Filling Capacities" or from the
container
of
the
antifreeze
manulacturer.
lncreaslng
the
anti-lreeze
in
the
coolant
lurther than shown on lhe
conlaher is
not
only uneconomical, it is also detrimental
lo
engine cooling.
Bleeding cooling system
and
lopping
up
coolanl
'1.
Move
temperature
control lever
to
2.
Unscrew
the vent plug
(arrow)
and
re-
move_
3.
Remove the expansion tank filter cap
and
slowly pour coolant into the tank.
Stop
pouring
as soon as
fluid
runs out of vent
plug
opening.
4.
The expansion tank should
only
be about
half
full
so as
to
prevent any overflow
once
the engine
is
warm.
5.
Screw
in the vent
plug
loosely.
6. Start the engine. Let engine run at
in-
creased
idle until
it
has reached
operat-
ing temperature (the radiator lan will iurn
on and off).
7.
When
air
bubbles at
vent plug
disappear,
iighten the plug (required torque
is
15-18
Nm or 11-13 ft lb).
8.
Check
coolant level in tank
and
top
up
to
"max" mark, if
necessary.
9.
Reinstall
the
expansion
tank
filler
cap.
After
a lest
drive recheck the
coolant
level.
See
"lilling
capacities" for amount requir-
ed.