Radiator Fan Runs When Engine Is Shut Off - Kawasaki Vulcan Forum : Vulcan Forums
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post #1 of 12 (permalink) Old 07-21-2012, 03:52 PM Thread Starter
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Radiator Fan Runs When Engine Is Shut Off

with kill switch and key switch left on for a few seconds (I'm guessing about 15 seconds). I wait until the fan stops before turning off the key switch. Just started noticing it since the weather got so hot. Is this normal?

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post #2 of 12 (permalink) Old 07-21-2012, 04:07 PM
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Normal. And you don't have to wait to pull the key. The fan will run even with the key removed from ignition if it needs to.


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post #3 of 12 (permalink) Old 07-21-2012, 04:48 PM
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Originally Posted by Pete7874 View Post
Normal. And you don't have to wait to pull the key. The fan will run even with the key removed from ignition if it needs to.
Pete,

My '97 turns off with the key. I think they redid the wiring about '04'ish to keep it on when the key is off. (Just checked the manual, the change happened in '00 with the C5 model.)

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Last edited by bikerbill; 07-22-2012 at 10:17 AM. Reason: Corrected change year
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post #4 of 12 (permalink) Old 07-21-2012, 05:46 PM
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The fan will come on and stay on as long as the engine is hot and it is told to come on. Absolutely nothing to worry about....totally normal.

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post #5 of 12 (permalink) Old 07-21-2012, 08:59 PM
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Pete,

My '97 turns off with the key. I think they redid the wiring about '04'ish to keep it on when the key is off.
Your right Bill.Originally the fan stays on even with the key off till till the coolant cools down.

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post #6 of 12 (permalink) Old 07-23-2012, 03:39 PM Thread Starter
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Normal. And you don't have to wait to pull the key. The fan will run even with the key removed from ignition if it needs to.
Yup! I checked it out today. Shut off engine, removed key, and fan kept running for about 5-10 seconds.

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post #7 of 12 (permalink) Old 07-23-2012, 08:48 PM
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2003 here, perfectly normal. Also I would like to add, that if you turn the key to the off position, you leave more battery juice available for the fan since with the key on you have all your lights still on, or at least the front running lights. I can hear the fan speed up when I shut off with the switch and after I turn the key.
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post #8 of 12 (permalink) Old 01-06-2019, 06:00 PM
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Radiator fan

I bought a 98 Vulcan 800. The fan used to come on after the engine got warm then when I cut it off it ran for a while. Last week it completely quit coming on. So I checked the fuse and it was blown so I put in a new one and still didn't work!Then I bought a new Temp Sensor and fan switch and now it comes on as soon as I turn the key on! And runs the whole time its running.When I turn the key off it cuts off? WTF?...Does anyone have a clue? Maybe they gave me a different switch?
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post #9 of 12 (permalink) Old 01-07-2019, 06:14 AM
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I bought a 98 Vulcan 800. The fan used to come on after the engine got warm then when I cut it off it ran for a while. Last week it completely quit coming on. So I checked the fuse and it was blown so I put in a new one and still didn't work!Then I bought a new Temp Sensor and fan switch and now it comes on as soon as I turn the key on! And runs the whole time its running.When I turn the key off it cuts off? WTF?...Does anyone have a clue? Maybe they gave me a different switch?
Check your ground.

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post #10 of 12 (permalink) Old 01-07-2019, 07:09 AM
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The temp sensor acts like a switch and only closes, allows power through, when the heat is high enough.
If your fan is always on that switch is NOT controlling like it should.
And this is independent of the ignition switch.

A bad ground would make the fan be off not on.

Check what changed from the old parts to the new parts.
Wiring, nuts and bolts pinching wiring, wires pulled to make the change, any wire moves.


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Last edited by vulcandoc; 01-07-2019 at 01:22 PM.
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