jeep grand cherr03 fan stays on until bat is drained
you probley have a bad fan switch,you can unplug it at bottom of fan.
Electric cooling fan is controlled by by vehicle's computer based on input from coolant temprature sensor on water neck (or when A/C is switched on). To turn fan on, computer sends signal to a solid state relay-not a mechanical relay-located under right headlight. A bad temp sensor (located on water neck) is also a possibility, but fan relay is first thing to check as it handles a lot of current and prone to failure.
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