Cooling System: Description and Operation
How the Circuit WorksClimate Control
Voltage is provided at all times to the radiator fan relay contacts through fuse 11, and to the A/C condenser fan relay contacts through fuse 19. With the ignition switch in ACC (I) or ON (II), voltage is provided to the coils of the relays through fuse 16 (in the under-dash fuse/relay box).
The relays are grounded by either the radiator fan switch or by the ECM (only the A/C condenser fan relay). Grounding the relays energizes their coils and applies battery voltage to the radiator and A/C condenser fan motors. Both fans then run until the fan switch or the ECM remove ground from the relay coils.
Except Climate Control
Voltage is provided at all times to the radiator fan relay contacts through fuse 11. With the ignition switch in ACC (I) or ON (II), voltage is provided to the coil of the relays through fuse 16 (in the under-dash fuse/relay box.)
The relay is grounded by the radiator fan switch. Grounding the relay energizes the coil and applies battery voltage to the radiator fan motor. The fan will then run until the fan switch removes ground.