Subaru 2002 Impreza Service Manual page 188

RADIATOR FAN
Cooling
A / C com-
pressor
2. MODELS WITH A/C
On models equipped with an air conditioning system, the ECM receives signals from the engine
coolant temperature sensor, vehicle speed sensor and A/C switch. According to these signals, the
ECM turns ON or
OFF the radiator main fan and sub fan simultaneously (and also selects the Hi
or Low fan speed in turbo model).
0
Non-turbo model
Lower than 95°C Between 95 and 99°C Higher than 100°C
(203°F) (203 and 21 0°F) (21 2°F)
Operation of radiator fans Operation of radiator fans Operation of radiator fans
I
A / C com-
pressor
Vehicle speed
Lower than 90°C Between 90 and 95°C Higher than 96°C
(1 94°F) (1 94 and 203°F) (205°F)
Operation of radiator fans Operation of radiator fans Operation of radiator fans
(12 MPH)
Between 20 and 69 km/h
(12 and 43 MPH)
f43 and 55 MPH)
Lower than 19 km/h
(12 MPH)
(56 MPH)
OFF OFF OFF OFF OFF Low-speed Low-speed
ON Low-speed*l Low-speed*l Hi-speed Hi-speed Hi-speed Hi-speed
High-speed*2 High-speed*2
I
Between 20 and 69 km/h
(12 and 43 MPH)
0
Turbo model
OFF OFF OFF OFF OFF Hi-speed Hi-speed
ON Hi-speed Hi-speed Hi-speed Hi-speed Hi-speed Hi-speed
Engine coolant temperature
Between 70 and 105 km/h
(43 and 65 MPH)
OFF OFF OFF OFF OFF Hi-speed Hi-speed
ON Low-speed Low-speed Low-speed Low-speed Hi-speed Hi-speed
I
Main fan
I
sub fan
1
Main fan
I
sub fan
I
Main fan
I
subfan
I
Higher than 106 km/h
(66 MPH)
Vehicle speed
OFF OFF OFF OFF OFF Hi-speed Hi-speed
ON OFF OFF Low-speed OFF Hi-speed Hi-speed
I
Engine coolant temperature
I
Main fan
I
sub fan
I
Main fan
I
sub fan
I
Main fan
I
sub fan
*1: When the intake air temperature is 76°C (169°F).
*2: When the intake air temperature is 78°C (1 72°F) or higher, the radiator fans perform "Hi-speed'' operation for 10 minutes.
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