Radiator Cooling Fan: Description and Operation
Cooling Fan DescriptionRadiator 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.