radiator MAZDA 232 1990 Suplement User Guide

E OUTLINE
OUTLINE
OUTttNE OF CONSTRUCTION
The cooling system in the 323 4WD model is basically the same as in the 323 2WD model.
Although there is no fundamental change from the BP DOHC of the 2WD model, the coolant circulation
path has been changed to direct coolant to the water-cooied turbocharger.
A two-stage thermostat is used in the BP DUHC turbocharged engine to stabilize the engine coolant tem-
peratu re.
The radiator and cooling fan specifications are different. The BP DOHC turbocharged engine of the 4WD
model uses a two-speed electric cooling fan.
93GOEX-704
COOLANT FLOW CHART (BP DOHC TURBO)
E-4

SPECIFICATlONS
-
km
Cootlng system
Coolant camacltv
EnginelTtansaxte
lrters [US Qt. Imo at)
8P SOHC ] 8P DOW Turbo
MTX ATX
I MTX
Water-cooled, forced crrculation
5.0 (5.3, 4.4)
I 6.0 t&3,5.3) -
1 Type
Water puma 1
I Water seal Centrifugal
Unified mechanical
seal
: Type I Wax,single stage”‘, Wax, two-stage*’ 1 Wax, two-stage
80.5-83.5 (177-182)“1
Opening temperature
“C (OF)
Main: 86.5-89.5 (188-l 93) *’ Main: 86.5-89.5 (lSS--193)
The:mosta! 1 Sub : 83.5-86.5 (182-188) Sub 83.G86.5 (182-188)
1 Full-open temperature OC
(OF) 95 (203)*‘, 100 (212)*’ i 100 (212)
L I
“...Except cold area, *2...Cotd area only
1 r 1 93GOEX-706 j Full-open lift mm (in) 8.5 (0.335) or more’l
Main: 8.0 (0.31).mln.‘2
Sub : 1.5 10.061 min * Main: 8.0 (0.31) min.
Sub : I.5 (0.06) mm.
Radiator 1 Type
Cap vaive opening-pressure ’
kPa (kglcm2, psi) Corrugated fin
74-l 03 (0.75-I .05, 11-l 5) j Tvm?
EIectnc I
Coohg fan f Outer drameter mm (in) 320 (12.6) 340 (13.4)
Blade
Number 4 5
Motor
/ Current A
6.6 * 1 Hi : 13.3 + 10% max.
Lo: 8.8 + 10% max. E-5

E OUTlANE
TWO-STAGE THERMOSTAT (BP DOHC TURBO)
MAIN VALVE
SINGLE-STAGE THERMOSTAT
(AMBIENT fEMP. -20% (4*f))
NTRANCE PORT TEMP
GINE EXIT PORT TEMP.
- 100 km/h
60 kndh
(63 mph) ~~~~~ (38 mph)
TWO-STAGE THERMOSTAT
A sub-valve is incorporated in the thermostat to stabilize the coolant temperature in the engine, to improve
cold weather performance, and to reduce heater output temperature fluctuations as noted in the diagram.
Operation
Stage 1
During cold weather operation, 83.5*C [182°F]-86.50C [t 88OF] only the sub-valve opens to control the
engine coolant temperature.
Stage 2
During normal operation, 86.5OC (1 88°F)-89.50C (I 93OF) the main valve opens to permit increased coul-
an: flow through the radiator.
E-6

RADIATOR AND COOLING FAN
The radiator and cooling fan specifications are revised.
Specifications
r
EnginelTransaxle BP SOHC 1 BP DOHC Turbo
ATX I
Item MTX MTX 1 Radiator I
Width 647 +
+
Core size
mm (in) H etght 390 t *-
Depth 16 25 e
Fm pnch
mm (in) 1.3 t c
Heat dissipaton capacity kcallh
38,800 43,800 C
Type -
Double tube - Transaxle oil cooler
Heat dissipation capacity
-
kcal/h I 1,650 -
Cooling fan
Number of biades
4 5 +
Outer drameter
mm (in> 320
340 C
Capacity
w-v 80-12 160-12 c
Current
A
1 I 6.6 * 1 Hi : 13.3 + 7 0% max. + Lo: 8.8 + 10% max.
93GOEX-708
OIL COOLER (ATX
;ECTION A-A
4WD MODEL ZWD MODEL
I
DEPTH E-7

E OUTLINE
ELECTRIC COCUNG FAN SYSTEM (BP DOHC TURBO)
System Circuit
I I
WITH A/C
r----‘-- -___- ---------.--------;
ADDITIONAL
FAN
MOTOR
I
II 1 A/C RELAY
RAD1ATdTHERMOSWITCH
ABOVE 105% I221 OF-): ON +IIAGNOSlS
CONNECTOR
WATER
THERMOSWlTCH
ABOVE 97% (207OF): ON
Operation 1. When the coolant temperature exceeds 97OC (207*F), the water thermoswitch turns ON to close the No.7
relay, and connects the + I and -1 terminals of the fan motor
connector. The fan motor turns at low
speed (about 1,660 rpm).
2. When the coolant temperature exceeds 105OC (221 OF), the radiator thermoswitch turns ON, to close the
No.2 and No.3 relays, and connects
the +2 and -2 terminals of the fan motor connector. The fan mo-
tor turns at high speed (about 2,200 rpm).
3. if the vehicle is equipped with air conditioning, the cooling fan motor operates whenever the
NC switch
and the blower switch are on, regardless of
the coolant temperature. Also, when the A/C switch and the blower switch are on, the A/C retay closes
to operate the additional fan
motur.
Note
l The water thermoswitch and the cooling fan reIay are normally-open switches.
Checking cooling fan operation 1. Jump across the TFA and the GND terminals
of the diagnosis connector with a jumper wire.
2. Turn the ignition switch to ON and verify that the cooling fan operates smoothly.
Note
l When the water thermoswitch connector is disconnected, the cooling fan wiif not operate.
E-8

SUPPLEMENTAL SERVICE INFORMAT1ON, THERMOSTAT E
SUPPLEMENTAL SERVICE INFURMATtON
The following points in the section are changed in comparison with Workshop Manual [Europe (1203-l 0-89F),
Australia (I 204-I 0-89f)].
Thermostat (BP DUHC Turbo only)
l Inspection
Electric cooling fan system (BP DOHC Turbo only)
l System inspection
Fan motor
l 1 nspection
Water thermoswitch (BP DOHC Turbo only)
l tnspection
Radiator thermoswitch (BP DOHC Turbo only)
l Removal I Inspection I Installation
Fan relay (BP DOHC Turbo only)
l Removal ! Inspection 93GOEX-710
-
THERMOSTAT (BP DOHC TURBO)
SUB-V E
‘A
/ INSPECTKM
1. Visually check that the thermostat valve is airtight.
2. Place the thermostat and a thermometer in water.
3. Heat the water and check the following:
Initial-opening temperature:
Main: 86.5-89.5% (188--t93°F)
Sub : 83.5-86.5OC (f82--f88QF)
Full-open temperature: 100°C (212°F)
Full-open lift
Main: 8.Umm CU.31 in) min.
Sub : f.5mm (0.06 in) min.
E-9

E ELECTRIC COOLING FAN SYSTEM
ELECTRIC COOLING FAN SYSTEM (BP
DUHC TURBO)
SYSTEM ClRCUIT
r
WITH A/C
r-- _______ ------
I ADDITIONAL
1 FAN
I PRESSL
SWITCH
I WATER
THERMOSWfTCtl
ABOVE 87OC (207OF): ON
RADlATOjl THERMOSWITCH
ABOVE 105*C (221 “I=): ON
8 93GOEX-719
-
%
J--- QY- -THERMOME?ERsi-=i
--
--------L-
93GOEX-7 i 2
E-10 SYSTEM INSPECTION
1. Jump across the test fan (TFA) terminal and the ground
(GN D) terminal of the diagnosis connector.
2. Turn the ignition switch ON and verify that the fan operates.
If the fan does not operate, inspect the cooling fan system
components and wiring harness.
3. Remove the radiator cap and place a thermometer in the
radiator filler neck.
4. Start the engine.
5. Verify that the fan operates when the coolant temperature
reaches approx. 97*C (207°F).
If it does, check the water thermoswitch.
(Refer to page
E--i I.)

E RADIATOR THERMUSWlTCki
RADIATOR THERMOSWITCH (BP DUHC TURBO)
REMOVAL I INSPECTION I INSTALLATION
I. Disconnect the negative battery cable.
2. Remove in the order shown in the figure.
3. Install in the reverse order of removal, referring to InstaHation Note.
7.8-13 H-m
(80-l 10 cm-kg, 69-95 h-lb)
(80-110 cm-kg,
69-95In4b)
REPLACE 1. Resonance chamber
2. Radiator cowling mounting bolts
3. Radiator thermoswitch connector
03WEX-027 4. Radiator thermoswitch
Inspection . . . . . . . . * . . . . . . . . . . . . . ..-. -.*,.a..- . . . . . . .I. below
Installation Note _.,............................._. below
1NSPECTlON 1. Place the switch and a thermometer in engine oil.
Warning
l Do not heat the engine oil above 12O*C (248OF) 2. Heat the engine oil gradually and check continuity of the
switch with
an ohmmeter.
Engine oil temperature “C (*F) Continuity
More than 105 (221) Yes I
t Less than 96 (205) No
1
3. If not as specified, replace the radiator thermoswitch.
Installation Note
Radiator thermoswitch
Caution
l Do not use an impact wrench for installation. 1. Install the radiator thermoswitch along with a new gasket.
Tightening torque: 5.9-12
Nom (60-120 cm-kg, 52-104 in-lb) 93GOEX.721 E-12

F2 OUTUNE
OUTLINE OF CONSTRUCTION
The fuel and emission control system of the new 323 4WD model is basically the same as that of the new
323 2WD modet; however, a turbocharger and knock control system are added to the BP TURBO model
and the fuel tank is designed
with separate right and left sections due to the installation of the propeller shaft
for the 4-wheel-drive system. A transfer pump is also equipped to pump the fuel from the left
to the right
(fuel pump side) section of the fuel tank.
The major points of difference between the 2WD model and 4WD model are as shown below.
93GOF2-705
Difference
Component 2WD 4WD
BP SUHC BP OOHC BP SOHC BP TURBU Remark
INTAKE AG! 1 Resonance duct 0 0 0 - -
SYSTEM
Resonance chamber 0
0 G -
VICS .-
ui- - -
Turbocharger - - -
0 Refer to page
FZ-12
I ntercooler - - -
0 Refer to page FZ-14
Air bypass valve - - -
0 Refer to page F2-14
FUEL SYSTEM Fuel pump control - - -
0 Refer to page F2-16
Transfer pump - -
0 0 Refer to page F2-18
Operating time for BP
Pressure regulator control 0 0 0 0
TURBO is different
(Refer to page F2-23)
Fuel pump reststorlrelay - - -
0 Refer to page F2-18
EVAPORATIVE
EMISSION
Fuel vapor vatve - -
CONTROL 0 0 Refer to page F2-16
SYSTEM
CONTROL
SYSTEM Point type
0 0
Throttle sensor 0 (MTX) -
-
Variable type - -
0 W-x) 0
Without heater
0 0 0 -
Oxygen sensor F
With heater - -
- 0 Refer to page F2-23
Water thermoswitch (on radiator)
-
Knock control system -
Overboost wami ng buzzer -
Turbocharge Indicator - -
C @TX) - NC cut-off system
- - 0
Refer to page F2-22
- -
0 Refer to page F2-21
- - 0 Refer to page F2-21
93GOF2-706

F2 CONTROLSYSTEM
AK CUT-OFF SYSTEM (AI-X)
To improve the retiability of the engine at high temperature condition, the water thermoswitch on the radiator
is switched OFF above approx. II I “C (232OF) and stops the A/C operation.
ECU
NC OPERATION BLOWER FAN
WATER
THERMOSWITCH
IABOVE
111 OC (232OF): OFF]
NC SWITCH
IGNITION
T
l 1
BLOWER SWITCH
MAGNET
CLUTCH
93GOF2-73
F2-24