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Old January 28th, 2013, 03:04 PM   #1
kj kyle
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06' jeep overheating

a few months back, My 06' jeep liberty started overheating. It turns out the electric fan wasn't working due to a blown fuse. I replaced the fan and fuse, and all is well. so last week it started over heating again. the electric fan stopped working again, but this time the fuse is intact. I let the vehicle warm up to operating temp, and the electric fan relay is getting roughly 14v, but the 40a fuse is only getting millivolts, if that. any ideas where to start?

I should also add it's not showing any MILs or codes.





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Old January 28th, 2013, 03:14 PM   #2
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Old January 28th, 2013, 03:15 PM   #3
firehawk
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Try bypassing the fuse and see if the fan works or just wire it to the battery.

Sounds like a short of sorts?


At first I thought the fan is on its way out pulling too much amperage and blowing the fuse. But if you have millivolts at the fuse then it sounds like a wiring issue. Could be faulty temp switch that turns it on. Or bad relay.
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Old January 28th, 2013, 03:27 PM   #4
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Quote:
Originally Posted by firehawk View Post
Try bypassing the fuse and see if the fan works or just wire it to the battery.

Sounds like a short of sorts?


At first I thought the fan is on its way out pulling too much amperage and blowing the fuse. But if you have millivolts at the fuse then it sounds like a wiring issue. Could be faulty temp switch that turns it on. Or bad relay.
there was some rust build up around the hub of the first fan that I replaced. I'm guessing that is what caused the fuse to blow. I'll try wiring it direct and report back.
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Old January 28th, 2013, 03:50 PM   #5
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Quote:
Originally Posted by kj kyle View Post
there was some rust build up around the hub of the first fan that I replaced. I'm guessing that is what caused the fuse to blow. I'll try wiring it direct and report back.
I am no electrical guru but you should be able to see how many amps the fans pulls to see if it is good or not. That is all I have on that subject though.
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Old January 29th, 2013, 07:18 AM   #6
Dans TJ
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that fuse will be hot with 12v at all times. idk if that wiring diagram is right thats posted above. it shows its a 30amp fuse but you have a 40 amp ciricled.

I would check for power at relay should have 2 termanls with 12v, if that wiring posted above is right then check it at pins 86 and 30 should have power. take paper clip jump 30 to 87 fan should come on if it doesnt then yuou have a wiring problem.

if your not getting 12 v but getting some power at fuse my guess is have high resistence in that wire not letting full power there.
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Old January 29th, 2013, 11:24 AM   #7
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If you not getting power at the fuse then the problem has to be between the battery and the fuse.
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Old January 29th, 2013, 12:42 PM   #8
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Yes, double check your diagram, and your reading at the relay.

Are you measuring the correct terminal at the relay?

You should have two hot terminals at the relay: 30 and 86. Do you have a good battery level on both terminals? (The key one is the 30 terminal, which powers the fan. The 14v at the 86 terminal is only to power the coil to turn on/off the relay).

If you suspect the relay could be bad (enough current to blow the fuse also could have welded or burned out the contacts), then swap it with one of the other relays there to see if it fixes it.

As someone else noted, jumpering from 30 to 87 should turn on the fan.

If that doesn't, you can take a wire right from battery to the 87 terminal, to see if that works. If it does, it tells you that power is interrupted somewhere between battery and the relay. If the fan doesn't turn on, you have a problem somewhere from the relay downstream to the fan.

You might need to pull out the power distribution center and have a look at the wires coming into the back of it, to make sure they are OK.

It should be fairly straight forward. You should have continuity from the battery + terminal to one side of the fuse. You should have continuity from the other side of the fuse to the 30 terminal, and from the 87 terminal to the + lead on the fan. The Fan should be grounded on the other side.

Trace those 4 items with a meter and you should find your problem.
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