Radiator Cooling Fan: Description and Operation

Cooling Fan Operation Description
Radiator cooling fan motors are controlled by ECM in the following conditions:





A/C switch: OFF

NOTE:
The following table indicates cooling fan operation while engine is running at 1,250 rpm.
The number of engine revolutions determines the temperature at which the cooling fan motor speed changes.








A/C switch: ON

Low speed
Cooling fan operates at low speed when A/C refrigerant pressure is more than 0.34 MPa (3.5 kgf/cm2, 49.3 psi).

Middle speed
Cooling fan operates at middle speed for a given time (0.5 sec.) when fan speed changes high from low.

High speed
Cooling fan operates at high speed when A/C refrigerant pressure is more than 1.6 MPa (16.3 kgf/cm2, 232 psi).

Fail-safe
Cooling fan operates at high speed when malfunction is detected by ECT sensor.