Grand AM V6-3300 3.3L (1992)
Radiator Cooling Fan Motor: Description and Operation
The Coolant Fan is controlled by the Engine Control Module (ECM) via the Coolant Fan Relay. The ECM receives input signals from the Coolant
Temperature Sensor (CTS), the Vehicle Speed Sensor, and the A/C Mode Selector. The ECM activates the Coolant Fan Relay when:
1.
The engine coolant temperature exceeds 108°C (227°F).
2.
The air conditioning is turned on.
3.
The Coolant Temperature Sensor fails.
Any of the above conditions will cause the ECM to ground CKT 535 or CKT 536 when the vehicle speed is below 56 km/h (35 mph). When CKT 535
or CKT 536 is grounded, the Coolant Fan Relay energizes, applying battery voltage to the Coolant Fan. The Coolant Fan will continue to run after the
Ignition Switch is turned to "OFF," until the engine coolant temperature lowers.
