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4
Fig. 8·26.
l.
Fresh ai r i ntake
2. ear
heater
3.
Windshield defroster
controi
regulates the
supply
of heated
coolant
to the
cell system.
The heater
controi
valve is
connected
in
series with the cell system so that al/ coolant which
passes through the cell system also passes through
the controi valve. The heated coolant warms up the
air which is fed through the heater unit by the heater
fan or the slipstream.
If
the coolant temperature in-
creases, the sensitive body of the thermostat expands
1--------\-'
2-----f/
Fig. 8·27 Air vents
l
.
Reor window
2.
Inner panel
3. Non·return valve
Heater system
4.
Air ducting to
rear seat
area
5. Electrically
heated
rear window
VOLVO
103287
thus acting
on
the
valve in the
controi system and
resulting
in
a
lesse
r
flow of
coolant. This
means that
the temperature of air flowing through the unit wil/
be
lower and the sensitive
body will
be again
effected. The result
wiU
be an increased flow of
coolant. This cycle is repeated continuosly so that a
stable air temperature is achieved.
The electrically heated rear window is included in the
heating system of
the
ear. The degree of heat is con-
trol/ed by a switch on the dashboard with which one
of two output ranges can be chosen. The one range
has a max. output of 150 watts and the other that of
40 watts. The controi switch is connected via a controi
relay (see wiring diagram) which cuts off the supply
of current when the ignition is switched
off.
This
safeguards the battery from discharging when the
engine is not turned over. See Group 84 concerning re-
placing rear
window.
Fig. 8·28. Wiring diagram for electrically heated
rear
window
8:
17
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