Engine, Cooling and Exhaust: Description and Operation
FansHow the Circuit Works
Voltage is provided at all times to the radiator fan relay contacts through fuse 4 (in the under-hood fuse/relay box) and to the A/C condenser fan relay contacts through fuse 1 (in the under-hood fuse/relay box). With the ignition switch ON (II), voltage is provided to the coils of the relays through fuse 14 (in the under-dash fuse/relay box).
The relays are grounded by either the radiator fan switch or by the ECM/PCM. Grounding the relays energizes their coils and applies battery voltage to the radiator and condenser fan motors. Both fans then run until ground is removed from the relay coils.