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 (in the under-hood fuse/relay box) and to the condenser fan relay contacts through fuse 58 (in the under-hood fuse/relay box). With the ignition switch in ON (II), battery voltage is supplied to the condenser fan relay coil. The PCM controls battery voltage to the radiator fan relay coil.
In normal operating coolant temperature conditions, the PCM grounds the condenser fan relay coil. Battery voltage is provided to the A/C condenser fan motor and the radiator fan motor in series through fuse 58 (in the under-hood fuse/relay box).
In extremely high coolant temperature conditions, the PCM grounds the condenser fan relay coil and the radiator fan relay coil. Battery voltage is provided to the A/C condenser fan motor through fuse 58 (in the under-hood fuse/relay box) and to the radiator fan motor through fuse 57 (in the under-hood fuse/relay box).
In both cases, the fans will run until ground is removed from the relay coil(s).