Electric fans won't turn on all of the sudden?? - Team Camaro Tech
Electrical & Wiring Troubleshooting electrical.

 
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post #1 of 8 (permalink) Old Nov 7th, 15, 01:47 PM Thread Starter
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Don
 
Join Date: Apr 2001
Location: Redding, CA, 96003
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Question Electric fans won't turn on all of the sudden??

Drove my car home for lunch and the fans worked fine..went to drive back to work and noticed the voltage was 1/2 - 1 volt higher than normal. Sure enough the fans aren't turning on.

Checked the fuse and tried swapping it just in case. Was going to try and swap the switch and then the relay? All the wiring looks solid, worked perfect for 2 1/2 years then just quit.

Any ideas of things I could check?

Thanks for pointers,

Donnie

68 Camaro - 540 HP AFR 412 CI, TH350 full manual, 3500 stall, 3.36 yukon gears/axles, 8.2" eaton posi, 17 inch Intro's. Jet black. Hotchkis sways, 3 in drop leafs/springs/bilsteins, G MOD, C5/4th gen brakes. 11.89 @ 119//2.01 60 ft
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post #2 of 8 (permalink) Old Nov 7th, 15, 02:52 PM
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Sean
 
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Re: Electric fans won't turn on all of the sudden??

How is it wired, toggle switch to relay? Is there a temp switch or just a toggle? If the fuse is ok it's probably the relay, a problem with electric fans is using an undersized relay and it will burn out. The relay needs to be rated to handle the load.
Could be the fan motor but I doubt it, could be a ground, only way to know is trace voltage to the point it stops.

Sean

1968 rs with an old school 354" SB2.2 pump gas motor.

Repetition does not transform a lie into a truth.

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post #3 of 8 (permalink) Old Nov 7th, 15, 04:19 PM Thread Starter
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Don
 
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Re: Electric fans won't turn on all of the sudden??

Thanks man, I'll swap the relay. That's probably it.

68 Camaro - 540 HP AFR 412 CI, TH350 full manual, 3500 stall, 3.36 yukon gears/axles, 8.2" eaton posi, 17 inch Intro's. Jet black. Hotchkis sways, 3 in drop leafs/springs/bilsteins, G MOD, C5/4th gen brakes. 11.89 @ 119//2.01 60 ft
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post #4 of 8 (permalink) Old Nov 7th, 15, 05:58 PM Thread Starter
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Don
 
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Re: Electric fans won't turn on all of the sudden??

So it was the relay. I had hosed off the engine earlier today...the wiring connector right at the relay was actually melted and the wiring connector was burned pretty good.

Wondering if I have an issue or if it was just the water causing it to short out and burn like that?

The fans do work fine even hooked up through the connectors that are a little burned up.

68 Camaro - 540 HP AFR 412 CI, TH350 full manual, 3500 stall, 3.36 yukon gears/axles, 8.2" eaton posi, 17 inch Intro's. Jet black. Hotchkis sways, 3 in drop leafs/springs/bilsteins, G MOD, C5/4th gen brakes. 11.89 @ 119//2.01 60 ft
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post #5 of 8 (permalink) Old Nov 7th, 15, 10:11 PM
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Sean
 
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Re: Electric fans won't turn on all of the sudden??

Glad to hear you got it fixed. Resistance kills wiring and connectors, the connector could have had a bad connection and heat will be created by that, which may be what you saw. Or the relay just failed.
Make sure your relay can support the load it's switching though, or it will fail.

Sean

1968 rs with an old school 354" SB2.2 pump gas motor.

Repetition does not transform a lie into a truth.

Franklin D. Roosevelt
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post #6 of 8 (permalink) Old Nov 8th, 15, 05:21 AM
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Steiner
 
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Re: Electric fans won't turn on all of the sudden??

I'm reading "fans" plural and "relay" singular. Might want to run each fan on its own relay. For one you cut the load on each relay and associated wiring, for another if you lose a relay you can still run one fan.

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post #7 of 8 (permalink) Old Nov 8th, 15, 08:04 AM Thread Starter
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Don
 
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Re: Electric fans won't turn on all of the sudden??

Good call Steiner. I'll add another relay here soon. Have been running a 40 amp for the last 2-3 years with no problems but I like the idea of having an "extra" relay in case one goes out like you're saying

68 Camaro - 540 HP AFR 412 CI, TH350 full manual, 3500 stall, 3.36 yukon gears/axles, 8.2" eaton posi, 17 inch Intro's. Jet black. Hotchkis sways, 3 in drop leafs/springs/bilsteins, G MOD, C5/4th gen brakes. 11.89 @ 119//2.01 60 ft
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post #8 of 8 (permalink) Old Nov 9th, 15, 02:14 PM
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Sean
 
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Re: Electric fans won't turn on all of the sudden??

Quote:
Originally Posted by Steiner View Post
I'm reading "fans" plural and "relay" singular. Might want to run each fan on its own relay. For one you cut the load on each relay and associated wiring, for another if you lose a relay you can still run one fan.
Ditto, that's why I was wondering how it was wired. Maybe the fan(s) you have are low amp draw, I don't know, but if it's two fans the easiest solution is two relays. I would put them on a T stat with a manual over ride on one or both.

Sean

1968 rs with an old school 354" SB2.2 pump gas motor.

Repetition does not transform a lie into a truth.

Franklin D. Roosevelt
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