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In the 1992 Lexus ES300 there is only one cooling fan. The cooling fan is operated hydraulically by fluid from the power steering reservoir. If there is a leak in the fluid pipe the fan can stop working and the car will over heat in traffic, otherwise it is fine. In any case the fan MUST always run when the A/C is switched on. Check for leaks in the rubber hose leading to the cooling fan from the hydraulic fluid reservoir.

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