Condenser Fan: Description and Operation
With A/CRadiator fan and condenser fan operation is controlled by the radiator fan control module. The control module can turn ON the radiator fan motor anytime during the first 15 minutes after the ignition switch is turned to LOCK (0).
The control module applies voltage to the condenser fan relay and radiator fan relay coils. When engine coolant temperature reaches 93°C (199°F) (S, Si, SR, 4WS) or 95°C (203°F) (VTEC, SR-V) engine coolant temperature switch A closes, and energizes both relays.
Voltage is then applied through fuse 47 to the radiator fan relay and the radiator fan motor, and, because the motor is grounded at G201, the radiator fan starts running.
Voltage is also applied through fuse 45 to the condenser fan relay and the condenser fan motor, and, because the motor is grounded at G381 (S) or G301 (Si, SR, 4WS, VTEC, SR-V) the condenser fan also starts running.
Both fans will run when the control module receives an "A/C request" signal from the BLU/RED wire when you turn ON the A/C switch in the heater control panel.
When you turn the ignition switch to LOCK (0), the condenser fan will stop, but the radiator fan will remain ON until engine coolant temperature switch B opens (below 105°C, 221°F), or the control module opens the circuit (about 15 minutes).