Porsche 928 1982 Owner's Manual page 29

Needle in white field - engine is cold
As long as needle is in white field, avoid
high speeds and high engine rpm, until
engine has reached normal operating tem-
perature. Do not lug the engine.
Needle in center striped field - normal
Under normal driving conditions, needle should
remain in center field. The needle may reach
the red field, especially at high engine loads,
but should return to "normal" when engine
load is reduced.
Needle in red field - warning
If needle enters the red field, the engine is
overheating. The central warning light will also
come on. Reduce speed and engine rpm. If
the needle does not return to the center field,
and the central warning light remains on, pull
off the road, turn off the engine and let it cool
down.
Coolant temperature warning light
If this light comes on, check whether the V-belt
driven mechanical fan is working. If the fan is
not working, the V-belt may be loose or broken.
The belt should be tensioned or replaced. Do
fan in front of the air conditioner condensor is
working.
On vehicles equipped with a factory installed air
conditioner, also check whether the electric
fan in front of the air conditioner is working.
WARNING: Do not touch the fan blades.
Wait until the engine has cooled down. The
electric fan switches on automatically when
the coolant reaches 92° C (198° F) and con-
tinues to run - even with the engine turned
off - until the coolant temperature has drop-
ped to 87° C (189° F).
If the electric fan is not working, there may be
a malfunction in the temperature sensor switch
or in the electrical system. Check for a blown
fuse.
If the problem cannot be readily located, be
sure the engine has cooled down sufficiently.
Then drive to the nearest Porsche dealer, but
carefully watch the coolant temperature gauge
and the warning light. Try to avoid engine id-
ling, very low speeds and engine speeds in
excess of 4000 rpm (revolutions per minute).
For other details refer to "Cooling System".
Fuel level gauge and
warning light
With the ignition on, the amount of fuel in the
tank is indicated by the fuel gauge needle.
Fuel level warning light
This light comes on when the fuel reserve level
in the tank is down to about 2.11 U.S. gals, or
8 liters. Time to refuel.
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