Cooling Fan Controls

FAN CONTROL SYSTEM
The fan control unit controls the operation of the radiator fan and condenser fan.

It uses inputs from the coolant temperature switch and A/C pressure switch (A and B) on the A/C system to determine when the fans should run and at what speed.

Additionally the temperature switch shuts down the A/C system if the coolant temperature exceeds 110°C (230 ° F). If the pressure in the A/C system is higher than normal, pressure switch B closes and the fans will run at high speed only. See Heating and Air Conditioning/ Air Conditioner Control System for description and specification of that function.

FAN TIMER SYSTEM
When the engine oil temperature is above approx. 105°C (221°F) after the engine is stopped, the condenser fan goes into operation to cool the engine for a maximum of 3O minutes.

When the temperature falls below approx. 90°C (194°F), the fan is stopped.

The fan motor runs at a low speed to decrease operation noise by using a resistor to the motor voltage.

The oil temperature switch is located on the rear cylinder head cover and the fan timer unit is located under the PGM-FI ECU cover.

If necessary, the fan begins operation 5 seconds after the ignition switch is turned off.