Patent ID: 7377237

Claim:
A cooling system comprising: an engine; an engine cooling circuit to deliver coolant to the engine, the engine cooling circuit including a radiator and a main fan to draw air through the radiator of the engine cooling circuit; an inverter; an inverter cooling circuit to deliver coolant to the inverter, the inverter cooling circuit including a heat exchanger located such that the main fan draws air through the heat exchanger when the main fan is active; a secondary fan to selectively draw air through the heat exchanger of the inverter cooling circuit, and a controller configured to control operation of the secondary fan; the main fan and optionally the secondary fan being configured to draw cooling air across the heat exchanger of the inverter cooling circuit during modes when the engine is running, and the controller being configured to operate the secondary fan to selectively draw air through the heat exchanger of the inverter cooling circuit during modes when the engine is not running.