Porsche 928 S 1984 Owner's Manual page 72

Changing coolant
(with cold engine only)
1. Move temperature control lever all the way
to the right. On vehicles equipped with an
automatic climate control system, also turn
on the ignition, leaving key in position "2"
for about 1 minute. Then turn ignition off.
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 lbft or 1.5-2.0 Nm
crankcase drain plugs:
33-37 lbft or 4 5 - 5 0 Nm
6. Add coolant until level reaches edge of filler
cap opening (with heater lever set at "warm").
7. Run engine at increased idle until it reaches
operating temperature and recheck cool-
ant level.
8. Coolant level should be in the middle of ex-
pansion tank above the filler mark.
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