cooling fan running - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 15 (permalink) Old 05-01-2007, 03:25 AM Thread Starter
 
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cooling fan running

i woke up at 3 this morning and the cooling fan on my bike was making noise and spinning slowly and then came on fully so i unplugged it inorder not to run the battery down thinking i looked up the switch on line and went back out and unplugged it and plugged the fan back in but it started the same thing... any suggestions??
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post #2 of 15 (permalink) Old 05-01-2007, 06:14 AM
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I'd guess a bad temperature sensor, or maybe the wires are just damaged and crossed.
The fan should work when the bike is shut off and is hot, but not at 3 in the morning !!


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post #3 of 15 (permalink) Old 05-01-2007, 08:57 AM
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I think you have a ghost...

Seriously, though, sounds like there's a short somewhere in that circuit. The fan shouldn't be drawing off the battery when the engine's off; so you're probably seeing a voltage draw-down, too. Check that circuit and make sure everything's in good order. Must be a frayed wire or bad connection in there.

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post #4 of 15 (permalink) Old 05-01-2007, 02:24 PM
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Could also be the fan switch. When one goes bad, there's no telling what it might do.

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post #5 of 15 (permalink) Old 05-01-2007, 05:46 PM Thread Starter
 
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i just ordered a clergys manual and from the looks of the prices on some websites i could replace the whole harness and junction boxes for cheaper then letting metro cycles trace it back for 79.95 an hour. ill try to follow it myself cause im pretty mechanicly inclined but if it comes down to it ill replace the whole harness and the manual should tell me which junction box works the fan and untill i get the manual ill un plug it everytime i get off it and hope for the best HAHA book should be here by the week end.... thanks for your imput guys.....
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post #6 of 15 (permalink) Old 05-01-2007, 05:57 PM
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from my last summer experience during hot days after nice traffc plagued commute home my bike would keep spinning the fan for couple minutes after it was shut off. my honda accord was doing the same...
bad switch or a bare wire shorting to ground comes to mind although luckly i didn't have a chance to have first hand experience in this area.
good luck

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post #7 of 15 (permalink) Old 05-01-2007, 09:06 PM Thread Starter
 
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im thinking that when the coolant gets to a certian temp it grounds out the fan and it comes on. (thats what my automotive electrical experance is telling me). so as long as long as im careful not to let it over heat (hence plug it in on the way home in the evening so it runs continuosly) and not let the battery run down i can ride it
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post #8 of 15 (permalink) Old 05-01-2007, 09:26 PM
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The fan can run at any time with or without the key in. The switch in the bottom of the radiator grounds the lead to complete the circuit.

If you pull the wire off the switch and ground it, the fan should run, no matter what.

If yours runs with the wire attached when it shouldn't (3 AM ???), it has a short to ground somewhere, most likely bad switch in the bottom of the radiator. Yes you can plug it in when riding to be sure its cooling then unplug it not to drain the battery. Don't suggest a lot of slow riding, or extensive idling as the fan draws a good deal of power to run and you don't want to tax the charging system at low stator output rpms.

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post #9 of 15 (permalink) Old 05-02-2007, 05:10 AM Thread Starter
 
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I thought it grounded to complete the circut but it runs when not plugged in SO there is a short to ground in that ground side somewhere and thats what ill have to chase down. and like i said it would be cheaper for me to replace the whole wiring harness rather than let the dealer check it out for 79.95 an hour.. thanks for the input guys
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post #10 of 15 (permalink) Old 05-02-2007, 09:05 AM
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Quote:
Originally Posted by Devilin View Post
I thought it grounded to complete the circut but it runs when not plugged in SO there is a short to ground in that ground side somewhere and thats what ill have to chase down. and like i said it would be cheaper for me to replace the whole wiring harness rather than let the dealer check it out for 79.95 an hour.. thanks for the input guys
I bought an extra wiring harness...shoot, I think I bought an extra everything. But if you want it - and it's in good shape; off of a 2000, I think -PM me. The only thing missing from it is the 6-pin connector for the r/r (pulled it to replace the busted one on Orleans).

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