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Author Topic: Weird thing happened with my e-fan.  (Read 4278 times)

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Offline Mozman68

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Weird thing happened with my e-fan.
« on: April 30, 2011, 10:41:04 AM »
Went to Sam's Club yesterday and backed into my garage to unload.  When I turned off the Jeep, the fan stayed running.... :yikes:

Tried my cutoff switch..nothing.

Turned it back on and off...nothing...just kept running.

Finally pulled the negative on the battery to get it off while I unloaded the groceries and then could take a look.

Couldn't find a single thing wrong with it, so through the negative back on so I could pull into my normal garage stall so I could rip into it.  Turned off the Jeep and the fan went off like it is supposed to....has been running fine since.

Controller is from DC Controls and he hasn't given me any ideas on what it could be.  I thought it had to be the controller but since it's working fine now, not sure if there's a way to tell. 

Any thoughts??   :confused:

Carrying 1/2" wrench for now in case I need to disconnect the battery again.
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Offline grumpygy

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Re: Weird thing happened with my e-fan.
« Reply #1 on: April 30, 2011, 03:58:56 PM »
Which DC controler did you get.  Also did you add in a solenoid like has been suggested on the FAQ's here.  JUst looked up the cheapest one they have and it says its for the ford fan just like it is no solenoid.
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Offline Mozman68

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Re: Weird thing happened with my e-fan.
« Reply #2 on: April 30, 2011, 04:25:15 PM »
The 2 speed DC controller has two heat sunk ones. Really hard to believe the problem would be there. Has been working fine for a day now.
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Offline sharpxmen

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Re: Weird thing happened with my e-fan.
« Reply #3 on: April 30, 2011, 04:36:30 PM »
Quote from: Mozman68 on April 30, 2011, 04:25:15 PM
The 2 speed DC controller has two heat sunk ones. Really hard to believe the problem would be there. Has been working fine for a day now.

isn't that the one with relays? if that's the case one of the relays might have gotten stuck, can't think of anything else other than the electronics in it going wacko (not sure how that one works so i'm just assuming).
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Offline Jeffy

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Re: Weird thing happened with my e-fan.
« Reply #4 on: April 30, 2011, 05:34:37 PM »
Quote from: sharpxmen on April 30, 2011, 04:36:30 PM
isn't that the one with relays? if that's the case one of the relays might have gotten stuck, can't think of anything else other than the electronics in it going wacko (not sure how that one works so i'm just assuming).
That would be my guess as well.  Not much there other then thermal switches and relays.  I would guess that one of the terminals heated up and then maybe melted.  Had that happen with a lose connector.
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Offline sharpxmen

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Re: Weird thing happened with my e-fan.
« Reply #5 on: April 30, 2011, 07:12:12 PM »
Quote from: Jeffy on April 30, 2011, 05:34:37 PM
That would be my guess as well.  Not much there other then thermal switches and relays.  I would guess that one of the terminals heated up and then maybe melted.  Had that happen with a lose connector.

on a second thought, maybe would have started again when he connected the battery back if that was the case

or, maybe it's meant to run after you turn off the engine if the temp in the radiator is high
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'95 YJ, NSG370 6spd / Hurst shifter, Dana 300 + 4:1 Doubler / tri-stick, Custom skid, Super D35 / Auburn LSD / 4.88, 35x12.5x15 BFG KM2, 64mm t/b, 1.7 RollerRockers, MkVIII e-fan, Dual Diaph Booster
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Offline Mozman68

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Re: Weird thing happened with my e-fan.
« Reply #6 on: April 30, 2011, 07:31:52 PM »
Nope...wired to cut off when the ignition is off. That's why it's so weird.
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Offline sharpxmen

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Re: Weird thing happened with my e-fan.
« Reply #7 on: April 30, 2011, 07:55:28 PM »
Quote from: Mozman68 on April 30, 2011, 07:31:52 PM
Nope...wired to cut off when the ignition is off. That's why it's so weird.

then i'm sticking with a stuck relay.
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'95 YJ, NSG370 6spd / Hurst shifter, Dana 300 + 4:1 Doubler / tri-stick, Custom skid, Super D35 / Auburn LSD / 4.88, 35x12.5x15 BFG KM2, 64mm t/b, 1.7 RollerRockers, MkVIII e-fan, Dual Diaph Booster
Latest: Corbeau BajaRS heated seats :dance: keeping warm the rear end

Offline Jeffy

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Re: Weird thing happened with my e-fan.
« Reply #8 on: April 30, 2011, 08:41:05 PM »
Replace the relay and see if it works again.  I would guess it's the low speed relay.
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"If the motor car were invented today, there is absolutely no way that any government in the world would let normal members of the public drive one."

Offline Mozman68

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Re: Weird thing happened with my e-fan.
« Reply #9 on: April 30, 2011, 08:53:27 PM »
It's been working fine since I moved i the first time...maybe it unstuck itself..... :confused:
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Offline Jeffy

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Re: Weird thing happened with my e-fan.
« Reply #10 on: April 30, 2011, 09:12:56 PM »
Quote from: Mozman68 on April 30, 2011, 08:53:27 PM
It's been working fine since I moved i the first time...maybe it unstuck itself..... :confused:
Well, I'd check the connectors to see if they're all OK and firmly connected.  Loose connectors cause high resistance and can eventually cause stuff to melt, de-solder&move or catch fire.  Could you tell if it was the HS or LS circuit that stuck?  Might pull the relays and check the socket for anything abnormal.  Try wiggling the prong on the relay.  There should be no play.
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"If the motor car were invented today, there is absolutely no way that any government in the world would let normal members of the public drive one."

Offline jfrabat

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Re: Weird thing happened with my e-fan.
« Reply #11 on: May 02, 2011, 05:35:00 PM »
Mine would come on for about 5 to 10 seconds sometimes if the radiator temp was high even with the ignition off.  It always turned itself off, though, and did not come back on again.  Maybe it does not ALWAYS need the ignition signal to operate...
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Offline Mozman68

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Re: Weird thing happened with my e-fan.
« Reply #12 on: July 15, 2011, 08:58:56 AM »
So...a couple of days ago, my fan decided to stay on again. Multiple starts/shut offs didn't help.

Was in the parking lot at work and getting ready to disconnect the battery cable so I could deal with it after work from home. Decided instead to give one of the DC Controls relays a tap with my wrench...*boo-ya*...fan shuts off as soon as I tap it.

Stuck relay.

Sent an email to Brian at DC Controls for his "thoughts" and hoping he will step up and offer to send a new control module as this should not have happened with a heat sunk relay after only about 9 months. We'll see what he says.
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Offline grumpygy

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Re: Weird thing happened with my e-fan.
« Reply #13 on: July 15, 2011, 09:05:28 AM »
Quote from: Mozman68 on July 15, 2011, 08:58:56 AM
So...a couple of days ago, my fan decided to stay on again. Multiple starts/shut offs didn't help.

Was in the parking lot at work and getting ready to disconnect the battery cable so I could deal with it after work from home. Decided instead to give one of the DC Controls relays a tap with my wrench...*boo-ya*...fan shuts off as soon as I tap it.

Stuck relay.

Sent an email to Brian at DC Controls for his "thoughts" and hoping he will step up and offer to send a new control module as this should not have happened with a heat sunk relay after only about 9 months. We'll see what he says.

You will never hear from him thats why I did not buy his.  He does have a 1 year warranty and a phone number I will see if I can find that.

Its only a 90 day warranty but just in case the phone number is 408 379 8951.
« Last Edit: July 15, 2011, 09:10:28 AM by grumpygy »
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Offline Mozman68

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Re: Weird thing happened with my e-fan.
« Reply #14 on: July 15, 2011, 09:12:45 AM »
I traded emails with him the first time it happened back in April.

He was questioning the wiring of my in cab switch, but that would have nothing to do with the fan staying on even with the ignition turned off.

I'll give him a week.
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