Engine Cooling Fan: Operation
On 2.2L M/T models, cooling fan relay is controlled by the coolant temperature switch. When coolant temperature exceeds 206°F (97°C), coolant temperature switch contacts close, closing the cooling fan relay and providing cooling fan operation. When A/C is on, the condenser fan relay controls the cooling fan relay and operates the fan. An electrical signal indicating fan operation is sent to the ECU so idle quality can be maintained.
On 2.2L A/T models, a 2-speed cooling fan is used. Cooling fan relay and high-speed fan relay are used to obtain variable fan speeds. Low speed is obtained when coolant temperature exceeds 206°F (97°C) and coolant temperature switch contacts close.
High speed is obtained when coolant temperature exceeds approximately 226°F (108°C) and High Speed Fan Switch (HSFS) closes, closing the high-speed fan relay and increasing fan speed. Cooling fan operates on high speed whenever A/C compressor is operating.
Two different electrical signals (one for low speed and one for high speed) are sent to Electronic Engine Control (EEC-IV) module for maintaining idle speed control. Fan speed variation is obtained by use of resistor, located between cooling fan relay and fan motor, next to cooling fan shroud. Relays are located on main relay box, near firewall. See Fig 1 .
On 3.0L, cooling fan operation is controlled by the EEC-IV module and Integrated Relay Controller Module (IRCM).