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Home >> Honda >> 2005 >> S2000 L4-2.2L >> Repair and Diagnosis >> Engine, Cooling and Exhaust >> Cooling System >> Description and Operation
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Cooling System: Description and Operation

How the Circuit Works

Voltage is provided at all times to the radiator fan relay contacts through fuse 57, and to the A/C condenser fan relay contacts through fuse 58. With the ignition switch ON (II) and the engine not cranking, voltage is provided to the coils of the relays through fuse 20.

The relays are grounded by either the radiator fan switch or by the ECM. 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.
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