OPERATING
INSTRUCTIONS
In order to maintain the corrosion
protection at all times and prevent the
system
from scaling up and the boiling
point from being lowered the mixture
should
not be altered
even
in the sum-
mer or in
warm
countries
by
adding
plain
water:
the
coolant
additive
pro-
portion
should be at
least
40%
(anti-
freeze
protection
down
to
about
-25°
C).
Screw cap on
again
tightly.
The
system must then be bled
with
en-
gine running (at a fast idle). Take air in-
take grille off (see page 104), open vent
screw
at top of radiator and set heater
lever
to "warm". As soon as coolant
emerges,
close vent screw. Top level up
in reservoir and expansion tank.
Fan
The
fan is driven electrically and
con-
trolled by a thermoswitch which is ac-
tuated by the coolant temperature.
When
the engine is hot, the fan may
continue to run when the engine has
been
stopped or it may switch on
suddenly
- even when ignition is off.
Notes
• If the fan is not running although the
coolant temperature is very high, the
fuse should be checked and renewed if
necessary
- see page 103.
• The speed of the fan does not depend
on engine
speed.
The cooling effect
can-
not therefore be increased by changing
down.
As
long as the engine runs smoothly and
a
gradient can be taken without a large
drop in speed it is not necessary to
change
down.
Driving
in
winter
The
mixture put in the system by the fac-
tory provides frost protection down to
about -25° C. To ensure
that
frost pro-
tection is adequate, the coolant should
be
checked before the cold
season
be-
gins
and if necessary, undiluted coolant
additive G11 or an additive
with
the
specification
TL-VW
774 A added.
If greater protection against frost is re-
quired,
the proportion of G 11 additive
can
be increased, but only up to 60%
otherwise the anti-freeze protection is
reduced
and furthermore the cooling
effect is impaired.
Vehicles
for export to cold countries
usually
have frost protection down to
-35° C.
79
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