Electric Cooling Fan System (Bp Dohc Turbo) - Mazda 323 Workshop Manual Supplement

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.
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