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Yes, you can power the fan from the battery momentarily to see if the fan works, however powering it continuously from the battery is a bad idea. I rigged my fiancee's so it would run when the key was on (I thought I was saving the time and money to replace a relay which is notoriously unreliable) Long story short, the fan had a bad bearing, the relay was bad and I ended up replacing them both along with the battery. I was just looking at this site because the fan will now not shut off even with the key out. The problem is the sensor-computer-relay-fan path. What ever happened to a simple switch telling the fan to turn on? it's still there in the 6 cylinder model look up pulse width modulator or radiator fan relay

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Q: Can you hook up the fan directly to the battery to see if it is working on 01 Jeeps?
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