Engine Cooling Fan: Operation: Probe

On 2.2L M/T vehicles, cooling fan relay is controlled by coolant temperature switch. When coolant temperature is greater than 206°F (97°C), coolant temperature switch contacts close. This closes cooling fan relay and provides cooling fan operation. When A/C is on, condenser fan relay controls cooling fan relay and operates cooling fan. An electrical signal, indicating fan operation, is sent to Electronic Control Assembly (ECA) so idle quality can be maintained.

On 2.2L A/T vehicles, a dual-speed cooling fan is used. Cooling fan relay and high-speed cooling fan relay are used to obtain variable fan speeds. Low speed is obtained when coolant temperature is greater than 206°F (97°C) and coolant temperature switch contacts are closed.

When coolant temperature is greater than approximately 226°F (108°C), High Speed Fan Switch (HSFS) closes. This closes high-speed cooling fan relay, causing high-speed operation of fan. 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 ECA for maintaining idle speed control. Fan speed variation is controlled by resistor, located between cooling fan relay and fan motor, next to cooling fan, near fan shroud. Relays are located on main relay box on firewall, near brake booster.

On 3.0L engine, cooling fan operation is controlled by Electronic Engine Control (EEC-IV) module and Integrated Relay Controller Module (IRCM). EEC-IV module is located below center of instrument panel. IRCM is located on firewall, near brake booster.