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  #25  
Old 04-14-2014, 11:06 PM
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Re: '99 4.0 Overheated

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Originally Posted by JGiardino89 View Post
Why would an electric fan come on when an engine is cold ? that doesn't make any sense. There is no heat to be dissipated.

I flushed everything very well, I am sure that I got most, if not all of the old stuff out.

Would a bad temp sensor cause the fan not to come on ? "Check gauges" came on, temp was pegged, but I looked under the hood and it was not over heating. But the fan was on.
Yes, a bad temperature sensor could prevent the fan to come on. This sensor sends its information to the PCM and the PCM sends the signal to the instrument cluster and a fan on signal to the fan relay.
On other jeeps which also have the mechanical fan on the waterpump, there is a constant base cooling coming from the mechanical fan. Jeepme said that on his jeep the electrical fan comes on as soon as he starts the engine. I don't know this setup with only electrical fan, but can be that the elec fan takes over the base cooling function when there is no mechanical fan.
You also have 12V on the fan connector, but did you check if the ground is ok as well?
But rereading your message you say that you had check gauges on, temp indicator pegged and fan on? So the fan is working, eventhough there was no evidence of overheating. Then i would just change the temperature sensor.
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  #26  
Old 04-14-2014, 11:50 PM
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Re: '99 4.0 Overheated

Well, after measuring all the power and grounds for the fan connector and relay connector, the wiring seems to be good.

I measured the resistance on the fan itself, and it seemed a little high.

I think the fan just has a dead spot in it because I plugged it in after giving it direct power from the battery, and it was working.

Worked when I turned the AC on, and it worked when it needed to come on if the Jeep was getting to that certain temperature.

I also changed out the fan relays with the old and new one that I bought yesterday and they both worked as they should.

So after seeing the the resistance in the fan was a little high, I went and purchased a new fan, installed everything, and it's working so far.

I let the Jeep idle in the driveway for 45 minutes after installing everything and it didn't overheat because the fan was coming on when it was supposed to.

Hopefully this has solved my issue. I will be keeping a close eye on everything and will update this thread if anything else happens.
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  #27  
Old 04-14-2014, 11:59 PM
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Re: '99 4.0 Overheated

So on your jeep the fan doesn't come on directly after starting the engine. This seems normal to me, eventhough jeepme reported differently.
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Old 04-15-2014, 12:14 AM
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Re: '99 4.0 Overheated

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So on your jeep the fan doesn't come on directly after starting the engine. This seems normal to me, eventhough jeepme reported differently.
Correct, I also don't see why an electrical fan would come on for a cold engine. There is no need for it.

I will check again to see if it does or not when I leave work in the morning. (Yes, morning, I work nights, lol)
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Old 04-15-2014, 02:30 AM
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Re: '99 4.0 Overheated

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Originally Posted by JGiardino89 View Post
Correct, I also don't see why an electrical fan would come on for a cold engine. There is no need for it.

I will check again to see if it does or not when I leave work in the morning. (Yes, morning, I work nights, lol)
It did sound strange to me as well, but he reported it for two jeeps. Could it be that those two jeeps had defrost selected, where the AC is switched on, independent of the AC switch position?
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  #30  
Old 04-16-2014, 03:58 PM
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Re: '99 4.0 Overheated

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Originally Posted by Frango100 View Post
It did sound strange to me as well, but he reported it for two jeeps. Could it be that those two jeeps had defrost selected, where the AC is switched on, independent of the AC switch position?
I'll try to remember to take a video when the Jeep cools off tonight. Right now I just got home from work so it's still hot. Maybe I'll run out and take a video where you can hear the different fan speed.
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Old 05-01-2014, 01:23 PM
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Re: '99 4.0 Overheated

Water pump impeller melted? Radiator restrictions internal or external.
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