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Unread 09-23-2013, 06:18 PM   #1
Ravie
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1999 WJ 
 
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Is this classic fan relay death?

Left my Wj running while I ran into the bank earlier, ac on. Came back to a check gauges light and a pegged temp gauge.

And no fan.

I have not yet tried it directly to battery to make sure the fan is ok but it did not come back on at any time driving home (i had to stop once)

Is this the relay under the bumper area on the passenger side? If so I see it has been replaced in the past..

Rav

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1999 WJ - Over 10k on the 4.0 rebuild. FB/BDS 2" lift (2.5") w/Bilstein 5125's. General Class Ham...KC0LUA
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Unread 09-23-2013, 06:32 PM   #2
Jaspah
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This is why I kept my mechanical clutch fan even though I replaced my fan relay. If that thing fails at least I have a backup.
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Unread 09-23-2013, 06:48 PM   #3
Ravie
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I6, no tow package = e-fan only. :-(
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Unread 09-23-2013, 11:47 PM   #4
cykaaro
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More than likely. Did it throw an engine code? Mine did when it went. Test the fan works. If so, replace the relay. When I hit the wreckers, I grabbed a bunch so have lots of backups if it ever goes. Also a overide switch in case it ever goes I can manually put the fan on if it goes I can run it until I can get it fixed.
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Unread 09-24-2013, 01:07 AM   #5
BigEag205
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Mine is throwing the code for fan relay, but the fans work and hasn't overheated ha. Not quite sure what to think of it.
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Unread 09-24-2013, 10:20 AM   #6
Jaspah
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Quote:
Originally Posted by BigEag205 View Post
Mine is throwing the code for fan relay, but the fans work and hasn't overheated ha. Not quite sure what to think of it.
It could just be stuck on. Not sure how well the fan will take running all the time while the Jeep is running if it is actually doing that.
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Unread 09-24-2013, 10:22 AM   #7
Ravie
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No mine didn't throw a code, but it was at 260 and the fan was not coming on, and didn't come on again, even if I switched on the A/C
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Unread 09-24-2013, 01:07 PM   #8
Highschool_WJ
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Easiest way to tell if the fan is bad is unhook it and wire straigjt to the battery, if it comes on get a new relay
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Unread 09-24-2013, 03:06 PM   #9
Ravie
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Yep, I did that just now when I got home and it's the relay.

I'm gonna have to wire a switch in for a couple of days...broke til payday. Ah, the joys of Just Emptying Every Pocket.
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1999 WJ - Over 10k on the 4.0 rebuild. FB/BDS 2" lift (2.5") w/Bilstein 5125's. General Class Ham...KC0LUA
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Unread 09-25-2013, 01:44 AM   #10
cykaaro
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I know that one! Been replacing the suspension since March I think. Only things not done are the track bar and axle bushings now LOL

If you're putting in an overide switch, using all 5 pins from a relay you can make it permanent. Basically when off, the proper fan relay will work and do it's job. Now, if it ever fails, once the switch is turned on, it'll turn on the fan, but stop the power from backfeeding into the system. Not that it's needed, but gives a bit of backup for the fan, unless the fan itself goes. As well, can turn the fan on with the engine off.
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Unread 09-25-2013, 05:55 AM   #11
Ravie
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Yesterday I was messing with a temporary wire to get the fan on and I thought both wires needed to be hooked up, but when I hook up only one the fan turns on. What's the deal with that? Is the case grounded already and those two wires are hot wires for speed control?
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1999 WJ - Over 10k on the 4.0 rebuild. FB/BDS 2" lift (2.5") w/Bilstein 5125's. General Class Ham...KC0LUA
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Unread 09-25-2013, 10:00 AM   #12
Brakeman62
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It could be the coolant temperature sensor on the thermostat housing.
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Unread 10-05-2013, 08:46 AM   #13
Ravie
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Put in the new relay and everything is working again but the CEL hasn't reset... must need to un-and-re-hook the battery...
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1999 WJ - Over 10k on the 4.0 rebuild. FB/BDS 2" lift (2.5") w/Bilstein 5125's. General Class Ham...KC0LUA
Burlbook48 sez "Nothing moves a project along faster than cubic dollars." Certified Thread Killer.
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Unread 10-05-2013, 10:42 AM   #14
Valor
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Mechanical fan clutch on the I6 isn't bullet proof. Two winters ago I had the fan clutch and water pump die on me at the same time. Thankfully it was frigid outside. But gotta love not having to deal with this fan relay business.

As for your code, you'll have to manually clear it. Disconnected the negative terminal for a few seconds should do it.
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Unread 10-05-2013, 11:47 AM   #15
Jaspah
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Quote:
Originally Posted by Ravie View Post
Put in the new relay and everything is working again but the CEL hasn't reset... must need to un-and-re-hook the battery...
When I replaced mine I just cleared the code with an ODBII reader and it never came back.
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