Cooling System: Description and Operation
FansHow the Circuit Works
Battery voltage is provided at all times to the radiator fan relay contacts through fuse 57, and battery voltage is also provided at all times to the A/C condenser fan relay contacts through fuse 58. The relays and the fuses are located in the under-hood fuse/relay box.
With the ignition switch in ON (II), battery voltage is supplied to the fan control relay coil and the A/C condenser fan relay coil through fuse 3 in the driver's under-dash fuse/relay box. The PCM controls the ground for both relays.
In normal operating coolant temperature conditions, the PCM grounds the A/C condenser fan relay coil. Battery voltage is provided to the A/C condenser fan motor and to the radiator fan motor in series through fuse 58. With the fan motors operating in series, the fans will run at approximately half speed.
In extremely high coolant temperature conditions or customer A/C request, the PCM grounds the A/C condenser fan relay coil and the Fan control relay coil. Battery voltage is provided directly to the A/C condenser fan motor through fuse 58 and to the radiator fan motor through fuse 57. Both fans will run at full speed.