Page 21
Locations of components
a
20
22
46
ATA
47TB
57
58
59
152A
1528
159
Earthing point
in the facia
Earthing point
in the luggage compartment
Ignition switch
between the front seats, at the gear lever
Fuse box
in the electrical distribution box in the en-
gine compartment, on the left-hand whee!
housing
Fuel level transmitter
in the fuel tank - the terminals are accessi-
ble from the luggage compartment
Fuel level gauge
in the cambined instrument
Fuel reserve warning lamp
in the combined instrument
3-pole connector (1985 and 1986 models)
under the spare-wheel well, in the luggage
compartment
12-pole connector
to the left of the steering column, under the
knee shield below the facia
2-pole connector
in the luggage compartment, under the
spare-wheel well
29-pole white connector (1984 models)
29-pole red connector (1985 and 1986
models)
in the electrical distribution box in the en-
gine compartment, on the left-hand whee!
housing. The connectors are accessible
from the interior of the car
Distribution terminal +15 (1985 and 1986
madels)
in the electrical distribution box in the en-
gine compartment, on the left-hand wheel
housing
Page 22
8 Temperature gauge
Temperature gauge
M1985—86
+30 +15
i :
123K
P GN/VT 1.0
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M1985 M1986
€
Neg Ne
123
183 SS
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GL/VT 0.75
of t45 8 Ths
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Saab 900.
— = |
Page 23
218 = Shift-up indicator
Shift-up indicator
e
+54
| M1985 M1986
4
eial= -
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124
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Saab 900
Page 24
EU
+30
5k
GR 2S
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Page 25
Air Conditioner (AC) — 1984 models
235
Operation
Certain cars are equipped with an Air Conditioner
{AC}.
Compressor and radiator fan motor 37
The AC can be switched on and off by means of AC
switch 169, which is supplied from fuse 6, via the 29-
pole black connector 152C. When the switch is de-
pressed, the lamp built into the button will be sup-
plied directly (not via the resistor), so it will light up
with full intensity.
Compressor 170 and ordinary radiator fan 37 are
connected via relay 156, which is supplied from fuse
25. The relay will be energised when the following
conditions are satisfied:
@ Pressure switch 166 is closed, i.e. the refrigerant
pressure is at least 2.8 bar.
@ Anti-freeze thermostat (cycling clutch contact)
171 is closed, i.e. the ambient temperature is at
least about +6 °C.
@ Throttle switch 167 is closed, i.e. the butterfly
valve is not open more than 70° (if the jumper is
cut).
e Temperature switch 168 is closed. (The switch will
open if the engine temperature exceeds around
+115 °C.)
Solenoid valve 142, which raises the engine idling
speed, is connected in parallel with the compressor
and the radiator fan. Diode 173 reduces the voltage
transients at the instant when the compressor is
switched off.
AC radiator fan 172
Extra radiator fan 172 for the AC is connected via
relay 155 and is supplied from fuse 6.
The relay coil is supplied from the contacts of relay
156 and from pressure switch 166. The AC radiator
fan thus runs when AC switch 169 is depressed and
pressure switch 166 is closed.
Recirculation valve
Recirculation valve 38, which controls the recircula-
tion damper, will be switched on when recirculation
switch 143 is depressed. The switch is supplied from
fuse 6. When the switch is depressed, the lamp built
into the switch will light up with full intensity.
The recirculation valve is also connected across main
switch 149, when the air distribution control is in
position 0 or ¢6 (regardless of the position of switch
143). The supply is taken from fuse 9, via ventilation
fan resistor 74.
Fault-tracing hints
As a general rule, supply to the unit is live when the
ignition switch is in the drive position. If none of the
components are faulty, check the cable harnesses,
connectors and earth connections.
Compressor and radiator fan motor 37
1. Check fuses 6 and 25 and check that the supply
to AC switch 169 and relay 156 is live.
2. Press the AC switch. Measure the voltage across
pressure switch 166 (the pressure switch should
be closed). Note that refrigerant will spray out
when the pressure switch is disconnected. Cau-
tion: Risk of frostbite.
3. Check cycling clutch contact 171. (It should
close at +6 °C.)
4, Check relay 156 and check that switches 167
and 168 in the earth circuit of the relay are
closed when the engine is idling and at normal
engine temperature, respectively,
5. Check that the supplies to the compressor and
the radiator fan are live.
AC radiator fan 172
1. Check fuse 6 and check that the supply to the AC
switch and to relay 155 is live.
2. Press the AC switch. Measure the voltage across
pressure switch 166 (the pressure switch should
be closed). Note that refrigerant will spray out
when the pressure switch is disconnected. Cau-
tion: Risk of frostbite.
3. Check that relay 155 is being energised and that
the supply to the AC radiator fan is live.
Recirculation
1. Check fuse 6 and check that the supply to recir-
culation switch 143 is live.
2. Press the switch and check that the recirculation
valve is activated.
3. Check fuse 9 and check that the supply to main
switch 149 in the air distribution control is live.
4. When the control is in position O or @ 6, the
recirculation valve should be activated.
Saab 900
Page 26
238 Air Conditioner (AC) — 1985 and 1986 models
Air Conditioner (AC) — 1985 and 1986
models
@
152B
5 (27 L193 VL_25
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1520
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438
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166
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M1985 M1986 EU, ME, FE
Saab 900
Page 27
Air Conditioner (AC) — 1985 and 1986 models
239
Operation
Some cars are equipped with an Air Conditioner (AC).
NOTE: This section does not cover the 1986 models
for markets in which the unit is equipped with a time
delay relay, such as the U.S.A. market. For particulars
of this unit, see the section entitled Air Conditioner
(AC) - 1986 models with time delay relay.
Compressor and radiator fan motor 37
The AC can be switched on and off by means of AC
switch 169, which is supplied from fuse 6, via the 29-
pole black connector 152C. When the switch is de-
pressed, the lamp built into the button will be sup-
plied directly (not via the resistor), so it will light up
with full intensity. (The pin numbers in parentheses
refer to the 1985 models.)
Compressor 170 and ordinary radiator fan 37 are
connected via relay 156, which is supplied from fuse
25. The relay will be energised when the following
conditions are satisfied:
@ Pressure switch 166 is closed, i.e. the refrigerant
pressure is at least 2.8 bar.
@ Anti-freeze thermostat (cycling clutch contact)
171 is closed, i.e. the ambient temperature is at
least about +6 °C.
® Throttle switch 167 is closed, i.e. the butterfly
valve is not open more than 70° (if the jumper is
cut).
e Temperature switch 168 is closed. (The switch will
open if the engine temperature exceeds around
+115 °C.)
Diode 173, which is connected in parallel with the
compressor, reduces the voltage transients at the
instant when the compressor is switched off.
Idling speed compensation
On 1985 models for the U.S.A. market, the supply to
contro! unit 200 for the fuel injection system will be
live when the compressor is running. The control unit
then regulates the idling speed by means of idling
speed adjustment motor 272 of the fuel injection
system.
Oncars for other markets, idling speed compensation
is carried out by solenoid valve 142, which is always
open when the compressor and the radiator fan are
running.
AC radiator fan 172
Extra radiator fan 172 for the AC is connected via
relay 155 and is supplied from fuse 6.
The relay coil is supplied from the contacts of relay
156 and from pressure switch 166. The AC radiator
fan thus runs when AC switch 169 is depressed and
pressure switch 166 is closed.
Recirculation valve
Recirculation valve 38, which controls the recircula-
tion damper, will be switched on when recirculation
switch 143 is depressed. The switch is supplied from
fuse 6. When the switch is depressed, the lamp built
into the switch will light up with full intensity.
The recirculation valve is also connected across main
switch 149 when the air distribution control is in
position O or 4 (regardless of the position of switch
143). The supply is taken from fuse 9, via ventilation
fan resistor 74.
Fault-tracing hints
As a general rule, the supply to the unit is live when
the ignition switch is in the drive position. If none of
the components are faulty, check the cable har-
nesses, connectors and earth connections.
Compressor and radiator fan motor 37
1. Check fuses 6 and 25 and check that the supply
to AC switch 169 and relay 156 is live.
2. Press the AC switch. Measure the voltage across
pressure switch 166 (the pressure switch should
be closed). Note that refrigerant will spray out
when the pressure switch is disconnected. Cau-
tion: Risk of frostbite.
3. Check cycling clutch contact 171. (It should
close at +6 °C.)
4. Check relay 156 and check that switches 167
and 168 in the earth circuit of the relay are
closed when the engine is idling and at normal
engine temperature, respectively.
5. Check that the supplies to the compressor and
the radiator fan are live.
AC radiator fan 172
1. Check fuse 6 and check that the supplies to the
AC switch and to relay 155 are live.
2. Press the AC switch. Measure the voltage across
pressure switch 166 (the pressure switch should
be closed). Note that refrigerant will spray out
when the pressure switch is disconnected. Cau-
tion: Risk of frostbite.
3. Check that relay 155 is energised and that the
the supply to the AC radiator fan is live.
Page 28
240 = Air Conditioner (AC) — 1985 and 1986 models
Recirculation
1. Check fuse 6 and check that the supply to recir-
culation switch 143 is live.
2. Press the switch and check that the recirculation
valve is activated.
3. Check fuse 9 and check that the supply to main
switch 149 in the air distribution control is live.
4. When the control is in position O or 4», the
recirculation valve should be activated.
Locations of components
2
22
35
37
38
57/67
og
74
142
143
149
150
Alternator
on the left-hand side of the engine
Earthing point
in the facia
Earthing point
on the radiator cross-member
Fuse box
in the electrical distribution box in the en-
gine compartment, on the left-hand wheel
housing
Selector switch for the ventilation fan
in the centre of the facia
Radiator fan motor (ordinary)
on the right-hand side of the radiator pack-
age
Recirculation valve
in the engine compartment, above the right-
hand wheel housing
3-pole/6-pole connector
in the engine compartment, behind the ex-
pansion tank
2-pole connector
one adjacent to radiator fan 37
one adjacent to AC radiator fan 172
Resistor for ventilation fan
accessible under the left-hand speaker
grille
Solenoid valve for raising the idling speed,
AC
on the engine, on the by-pass hose of the
throttle housing
Recirculation switch, AC
in the centre of the facia
Main switch for ventilation fan
on the facia, in the air distribution control
(upper contact)
Air distribution switch, AC position
on the facia, in the air distribution control
(lower contact)
152B
152C
155
156
158
166
167
168
169
170
i
172
Lis
200
29-pole red connector
29-pole black connector
in the electrical distribution box in the en-
gine compartment, on the left-hand wheel
housing. The connectors are accessible
from the interior of the car.
Relay for the AC radiator fan
in the electrical distribution box in the en-
gine compartment, on the left-hand wheel
housing
Relay for the AC compressor
in the electrical distribution box in the en-
gine compartment, on the left-hand wheel
housing
Negative distribution terminal
in the electrical distribution box in the en-
gine compartment, on the left-hand wheel
housing
Pressure switch for the AC radiator fan
in the engine compartment, on the drying
agent container, forward of the right-hand
wheel housing
Throttle switch, AC
on the left-hand side of the engine throttle
housing
Coolant temperature switch, AC
onthe radiator inlet hose, near the distribu-
tor
Switch, AC
in the centre of the facia
Compressor for the AC
at the rear of the engine compartment
Anti-freeze thermostat (cycling clutch con-
tact) for the AC
in the engine compartment, on the right-
hand side of the air conditioner housing
Radiator fan for the AC
on the left-hand side of the radiator pack-
age
Diode for the AC compressor
in the cable harness, at the rear of the valve
cover
Control unit for the fuel injection system
forward of the right-hand front door, below
the facia on the left-hand side (behind the
trim)
Saab 900
Page 29
Air Conditioner (AC) — 1985 and 1986 models 241
Components
143 7
149 169 4
150
M1986
149
38 142 143 150
z 156 M1986
: \
: £ a. 4 a)
; ima
Pi 155 156 M1985} |I66 167 168
Li
nG9 h70 71 00 }
Saab 900
Page 30
Air Conditioner (AC) — 1986 with time delay 243
Operation
Certain cars are equipped with an Air Conditioner (AC). This
section covers the 1986 models for the U.S.A., Canadian,
Japanese and Australian markets only.
Compressor and radiator fan motor 37
The AC can be switched on and off by means of AC switch
169. which is supplied from fuse 6, via the 29-pole black
connector 152C. When the switch is depressed, the lamp
built into the button will be supplied directly (not via the
resistor), so it will light up with full intensity. (When the
switch is not activated, the lamp is supplied from the instru-
ment lighting rheostat }
Compressor 170 and ordinary radiator fan 37 are con-
nected via relay 156, whose contacts are supplied from
fuse 25. The relay will be energised when the following
conditions are satisfied:
@ Pressure switch 166 is closed, |e. the refrigerant pres-
sure is at least 2.8 bar.
@ Anti-freeze thermostat (cycling clutch contact) 171 is
closed, i.e, the ambient temperature is at least about
+6 "C.
When the relay is energised, the compressor will be sup-
plied only if temperature switch 168 is closed. (The switch
will open if the engine temperature exceeds around
+115 °C.)
Diode 173, which is connected in parallel with the com-
pressor, reduces the voltage transients at the instant when
the compressor is switched off.
Delayed connection when starting
Relay 156 is equipped with two time delay functions. One of
therm is activated whenever the engine is being started.
Ignition switch 20 (in the start position) supplies pin 50,
and if switch 169 is then depressed, the energising of the
relay and thus starting of the compressor will be delayed for
around 10 seconds, to avoid an excessive load on the
battery.
Idling speed compensation and cut-out at full load
There are two systems, i.e. one for cars equipped with the
16-valve engine and the other for cars with the 8-valve
engine.
On cars with the 16-valve engine, idling speed adjustment
motor 272, which is controlled by contro! unit 200 for the
fuel injection system, is used for idling speed compensa-
tion. To prevent the engine speed from falling when the
compressor is startec at engine dling speed, the energis-
ng of the relay electronics is delayed. to give the contro!
unit time to adjust the idling speed.
The control unit receives a signal via relay pin 16 when the
time delay of the relay is activated, and it then starts idling
speed compensation. After 0.6 seconds, the relay will be
energised and the compressor will start. The relay elec-
tronics are supplied (in the drive position) via pin 15.
When the engine is being run at full throttle, pin TK of the
relay is earthed through throttle angie transmitter 203, and
the relay trips the compressor.
On cars with the 8-valve engine. solenoid valve 142, which
is always open when the compressor is running, is used for
idling speed compensation.
When the engine is being run at full throttle (butterfly valve
open more than 70°), pin TK of the relay is earthes through
throttle angie transmitter 203, and the relay trips the com-
pressor.
AC radiator fan 172
Extra radiator fan 172 for the AC is connected via relay 155
and is supplied from fuse 6.
The relay coil is supplied from the contacts of relay 156 and
from pressure switch 166. The AC radiator fan thus runs
when AC switch 169 is depressed and pressure switch 166
is closed,
Recirculation valve
Recirculation valve 38, which controls the recirculation
damper, will be switched on when recirculation switch 143
is depressed. The switch is supplied from fuse 6. When the
switch is depressed, the lamp built into the switch will light
up with full intensity.
The recirculation valve is also connected across main
switch 149, when the air distribution control is in position dO
or 4 (regardless of the position of switch 143). The supply
is taken from fuse 9, via ventilation fan resistor 74.
Fault-tracing hints
As a general rule, the supply to the unit is live when the
ignition switch is in the drive position. If none of the compo-
nents are faulty. check the cable harnesses, connectors
and earth connections.
Compressor and radiator fan motor 37
1. Check fuses 6 and 25 and check that the supplies to
AC switch 169 and relay 156 are live.
2. Press the AC switch. Measure the voltage across pres-
sure switch 166 (the pressure switch should be
closed). Note that refrigerant will spray out when the
pressure switch is disconnected. Caution: Risk of
frostbite.
3. Check cycling clutch contact 171. (!t should close at
+6 °C.)
4, Check that the relay is energised and that the relay
contacts (87 and 87A) are live. If not, check that the
coilfelectronics are being supplied from thermostat
17 Land from the + 15 cistribution terminal. When the
relay is energised, terminal 16 should be live. At full
throttle, terminal TK should be earthed.
5. Check that the supplies to the compressor and the
radiator fan are live. (Temperature switch 168 should
be closed.)
AC radiator fan 172
1. Check fuse 6 and check that the supply to the AC
switch and to relay 155 is live
2 Press the AC switch. Measure the voltage across pres-
sure switch 166 (the pressure switch should be
closed). Note that refrigerant will spray out when the
pressure switch is disconnected. Caution: Risk of
frostbite.
3. Check that relay 155 is being energised and that the
supply to the AC radiator fan is live
Saab 900