Radiator Cooling Fan: Description and Operation

Cooling Fan Description

Radiator cooling fan motors are controlled by ECM on the following conditions.

NOTE:

Radiator cooling fan motors operate only while engine is running.





A/C switch: OFF

NOTE:

The following table indicates cooling fan operation while engine is running at 1,250 rpm.

It depends on engine revolution to determine temperature for changing proper fan motor speed.










A/C switch: ON

NOTE:

It depends on engine revolution to determine temperature for changing proper fan motor speed.

Low speed

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

Middle speed

Cooling fan operates at middle speed for a given time (0.3 sec.) when fan speed changes high from low.

High speed

Cooling fan speed changes at high speed from low when A/C refrigerant pressure is more than specified value 1.6 MPa (16.3 kgf/cm2, 232 psi).

Fail-safe

Cooling fan operates high speed on condition that malfunction is detected in ECT sensor.