Operation CHARM
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Lexus
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1991
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LS 400 V8-4.0L (1UZ-FE)
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Repair and Diagnosis
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Engine, Cooling and Exhaust
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Cooling System
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Radiator Cooling Fan
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Radiator Cooling Fan Motor
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Description and Operation
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System Description
System Description
The system used on this model is operated by a series of relays and switches. Whenever the water temperature switch or the high pressure switch grounds, the cooling fan relays are energized, causing the cooling fans to operate.