Cooling Lines; M Mechanism And Function; General - Subaru SVX 1992 Manual

2-5 [M100) ENGINE COOLING SYSTEM
M MECHANISM AND FUNCTION
1 .
General
ECU sends ON or OFF, and Lo (low) MID (medium) or Hi
The engine cooling system consists of a down-flow
(high) switch signals to the radiator main fan and sub fan
radiator which features high heat-dissipation perfor-
in response to signals from the water temperature
mance, an electric motor fan, a water pump, a thermo-
sensor, vehicle speed sensor 2, A/C switch and A/C
stat, and a thermometer . The reserve tank is designed
trinary switch .
to eliminate the need for replenishing coolant .
Water temperature sensor
i
-,
I----3I Radiator main fan
Vehicle speed sensor 2
ECU
A/C switch
I---I I- -
Radiator sub fan
A/C trinary switch
2 . Cool
ing Lines
2) 2nd step . . . With thermostat opened
This cooling system operates in three steps depending
When the coolant temperature is above 76 - 80°C (169
on the temperature of the coolant flowing through the
- 176°F), the thermostat opens and the coolant flows
cooling circuit .
through the radiator where it is cooled .
1) 1st step . .. With thermostat closed
3) 3rd step . . . With electric cooling fan operating
At coolant temperature of below 76°C (169°F), the ther-
When the coolant temperature rises above 95°C (203°F),
mostat remains closed and the coolant flows through the water temperature sensor is turned on and radiator
the bypass and heater circuits .
fan rotates .
This permits the engine to warm up quickly .
r
Cylinder hea
I I nlet nlet
Throttle
Cylinder block RH
body
Cylinder jacket R H
Water
p Pum ---d
Radiator
i
Cylinder jacket LH
I
Cylinder block LH
Outlet
+ - Thermostat _
Cylinder head LH
Heater
Reservoir
tank
C2-001
Fig. 1
2