Porsche 92854 Owner's Manual page 75

Winter operation
At the beginning of the winter season, have
the coolant checked for anti-freeze concen-
tration.
The ratio between water and anti-freeze, ne-
cessary to prevent freezing, depends on the
anticipated outside temperatures. The ratios
can be taken from the mixing chart listed under
"Filling Capacities" or from the container of
the antifreeze manufacturer.
Increasing the anti-freeze in the coolant
further than shown on the container is not
only uneconomical, it is also detrimental
to engine cooling.
Bleeding cooling system
If more than about 1 .1 U.S.qt.or 1 Liter must be
added, the cooling system should be bled.
1. Move the temperature control lever (upper
lever) in the center console all the way to
the right.
2. Start the engine and allow it to run at in-
creased idle for about one minute.
3. Turn the engine off.
4. Recheck the coolant level and add as ne-
cessary.
72
Changing coolant
1. Set the temperature control lever at 85° F/
30° C with the engine cooled down, and
switch on the ignition.
2. Remove filler cap from expansion tank.
3. Unscrew and remove drain plug (arrow)
from radiator and drain coolant.
4. Unscrew and remove drain plugs (arrow)
from left and right hand sides of crankcase
and drain coolant.
5. Replace seals for drain plugs on crankcase
and the O-ring for drain plug on radiator.
Tightening torques:
radiator plug:
1.1-1.5 Ibft or 1.5-2.0 Nm
crankcase drain plugs:
33 - 37 Ibft or 45 - 50 Nm
6. Add coolant until level reaches edge of filler
cap opening (with h e a t e r level s e t at "warm").
7. Run engine at increased idle until it reaches
operating temperature and recheck cool-
ant level.
8 . coolant level should b e i n the m i d d l e o f e x -
pansion tank above the filler mark.