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Old 06-20-2011, 01:02 PM   #1
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Overheating Problem

Hey all, I just bought a 2004 Wrangler 4.0 auto a couple weeks ago, and took it down on a road trip to South Padre Island. It did wonderfully on the way down bu on our way back we hit Houston's lovely stop and go traffic and it started to overheat on me.

The Jeep has an electronic fan which is running all the time, I'm not sure what kind it is, but it pushes the air pretty good. So I ruled out the fan clutch since it doesn't have one. The fluid is full, the overflow was empty, I filled it up to the full mark and it's down now after driving it around town to the fill line. Could it have air in the system:? Not sure how to 'burp' it. The temp gauge is around 210-220 when driving with speed down the highway, it's when you hit traffic lights or heavy traffic it'll get up in the red. I can blast the heater on and in a few seconds it'll drop back down real quick.

At first I was thinking thermostat, but I'm thinking it could just be as simple as the radiator cap?

Any thoughts?

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Old 06-20-2011, 01:09 PM   #2
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Is the fan "pushing" or "pulling" the air. If the fan is pushing the air through the front of the rad it is turning the wrong direction, it should be pulling air through the front of the rad towards the engine. The '04 didn't come with an electric fan stock so somebody had to put it in there. The fan also should not be running all the time. If the thermostat is bad the coolant would not circulate therefore you would not get hot coolant through the heater core which would mean you would not get heat through the heater. If anything I would have to say the fan is not adequately cooling the rad.

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Old 06-20-2011, 01:22 PM   #3
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My 04 2.4L came stock with an electric fan. Yes I am the original owner.
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Old 06-20-2011, 01:26 PM   #4
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You will note in the first post he said it was a 4.0 which never came with an electric fan. Put back the stock fan and clutch to start and go from there.
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Old 06-20-2011, 01:29 PM   #5
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Yea the fan is mounted right on the radiator in front of the engine, pulling the air through the radiator to the front of the engine.

I'll have to look a little better but it may be hard wired to be on all the time... I'll have to get a better look at it later.
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Old 06-20-2011, 01:30 PM   #6
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My 99 4.0 automatic is also running very hot (210 degrees). I have the mechanical fan and clutch and it is turning. Not sure where to start, thermostat? waterpump?
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Old 06-20-2011, 01:34 PM   #7
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You will note in the first post he said it was a 4.0 which never came with an electric fan. Put back the stock fan and clutch to start and go from there.
I saw that but maybe the thing came with a 4 banger and someone replaced it with a 4.0. Very common with used 4 bangers.
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Old 06-20-2011, 02:02 PM   #8
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It does have an electronic fan thermostat on there so it's not hard wired to run all the time.
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Old 06-20-2011, 02:26 PM   #9
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My 99 4.0 automatic is also running very hot (210 degrees). I have the mechanical fan and clutch and it is turning. Not sure where to start, thermostat? waterpump?

210 is normal operating temp.
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Old 06-20-2011, 03:23 PM   #10
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in addition to this temp issue, when it reachs 210 I get an odd noise in the bell housing area, almost sound like sticking a plastic fork in the spokes of a bicycle tire. It only does it when the jeep is in reverse, nuetral and drive. in park no noise. This is an automatic.
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Old 06-20-2011, 03:26 PM   #11
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Took it down to the shop just now, and the mechanic (which I've known for awhile) said that fan is much stronger than a stock fan/clutch and it should be good. He did recommend that I spray the radiator with simple green and let it sit for a bit, then high pressure spray it out and watch how much dirt and gunk comes out. Not to mention it was full of bugs.

Of course he said to be careful on not bending the fins when spraying to not get too close. But hopefully that's all there will be to it. *crosses fingers* I'll let ya know.
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Old 06-20-2011, 03:51 PM   #12
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Your mechanic doesn't know Jeeps too well. The factory setup pulls about 10000 CFM. The better electric ones pull about 3500.
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Old 06-20-2011, 04:07 PM   #13
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I'm wondering if it's the stock fan shroud on there as well if I do need to pull the electric one and replace with stock fan/clutch.
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Old 06-20-2011, 04:10 PM   #14
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Also I guess I can get a stock fan/clutch at Autozone or something like that?
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Old 06-20-2011, 04:18 PM   #15
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Quote:
Originally Posted by Jar_Head
in addition to this temp issue, when it reachs 210 I get an odd noise in the bell housing area, almost sound like sticking a plastic fork in the spokes of a bicycle tire. It only does it when the jeep is in reverse, nuetral and drive. in park no noise. This is an automatic.
You better get your transmission fluid and filter changed soon
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Old 06-20-2011, 05:35 PM   #16
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You better get your transmission fluid and filter changed soon

I guess I will make that the next item on the list. Still not sure why it seems to run hot.
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Old 06-21-2011, 12:53 AM   #17
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Your mechanic doesn't know Jeeps too well. The factory setup pulls about 10000 CFM. The better electric ones pull about 3500.
Thanks Mo, saved me the trouble. Electric fan companies only wish they could duplicate the output of the OEM mechanical fan at something under 500 bucks.
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Old 06-21-2011, 01:36 AM   #18
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Yep they wish they could.....
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Old 06-21-2011, 03:13 PM   #19
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OK I figured out why they put an electronic fan on there, it has a body lift. Judging where the stock fan would go, it won't fit right within the shroud. So before I buy the fan/clutch for it I'll need to figure out how to move the fan shroud down or the entire radiator/fan shroud

I unfortunately bought it that way....
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Old 06-22-2011, 12:17 AM   #20
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OK I figured out why they put an electronic fan on there, it has a body lift. Judging where the stock fan would go, it won't fit right within the shroud. So before I buy the fan/clutch for it I'll need to figure out how to move the fan shroud down or the entire radiator/fan shroud

I unfortunately bought it that way....
Do a Motor Mount lift which will raise the front of the motor. Then you can slot the fan shroud if you need a bit more or re-drill the holes in the flanges off the side of the radiator.

Resist the urge to do more than lift the stock mounts with spacers unless you enjoy more vibes.
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Old 06-22-2011, 01:11 AM   #21
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if your overheating problem occurs most at idle or in stop and go traffic then it would be a terrible idea to go from a electric fan to a mechanical fan. It is possible that the electrical fan chosen by the previous owner may be a PoS but if I would not reccomend going back to a mechanic fan for slow speed over heating.
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Old 06-22-2011, 01:28 AM   #22
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if your overheating problem occurs most at idle or in stop and go traffic then it would be a terrible idea to go from a electric fan to a mechanical fan. It is possible that the electrical fan chosen by the previous owner may be a PoS but if I would not reccomend going back to a mechanic fan for slow speed over heating.
Did you miss post 12 above? No electric fan will cool better than a properly functioning clutch setup. Period. I spent the last 2 summers rockcrawling at 2 miles an hour with the AC blasting for hours at a time in 110 degree temps. The hottest I ever saw was a needles width to the right of 210. Bone stock cooling system with a quart of water-wetter.
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Old 06-22-2011, 10:41 AM   #23
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Do a Motor Mount lift which will raise the front of the motor. Then you can slot the fan shroud if you need a bit more or re-drill the holes in the flanges off the side of the radiator.

Resist the urge to do more than lift the stock mounts with spacers unless you enjoy more vibes.

Is it absolutely necessary to install a motor mount lift on there? Or will lowering the fan shroud be enough to compensate for the lift? It looks like it's a 3" BL installed. I don't necessarily like it that much because of the gap it makes, but for now I can't change it until I get a little more cash to spend on it.

I was wondering just as at least a temporary fix to put the stock cooling system back into place. Also, any recommendation on the motor mounts?
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Old 06-22-2011, 11:14 AM   #24
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Is it absolutely necessary to install a motor mount lift on there? Or will lowering the fan shroud be enough to compensate for the lift? It looks like it's a 3" BL installed. I don't necessarily like it that much because of the gap it makes, but for now I can't change it until I get a little more cash to spend on it.

I was wondering just as at least a temporary fix to put the stock cooling system back into place. Also, any recommendation on the motor mounts?
No, you're not going to fix that problem very easily without dropping the body lift down to a reasonable amount like 1" or so.

Go to Performance accessories and order up their replacement pucks. They are roughy 1 dollar each or so and then hit the local hardware store for the right length bolts. You should be able to get the body correct for about 20 bucks or so.

Then you can start fixing the rest of your problems.
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Old 06-22-2011, 01:33 PM   #25
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check to see if both rad holes are hot to the touch if not it aint going thru the therostate
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Old 06-22-2011, 02:15 PM   #26
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check to see if both rad holes are hot to the touch if not it aint going thru the therostate
Huh?
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Old 06-22-2011, 02:30 PM   #27
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Huh?
Interpretation..... he said check to see if upper and lower radiator hoses get hot when running,
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Old 06-22-2011, 02:36 PM   #28
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No, you're not going to fix that problem very easily without dropping the body lift down to a reasonable amount like 1" or so.

Go to Performance accessories and order up their replacement pucks. They are roughy 1 dollar each or so and then hit the local hardware store for the right length bolts. You should be able to get the body correct for about 20 bucks or so.

Then you can start fixing the rest of your problems.

Got a link where I can get those replacement pucks at? There's a lift shop here in town I'm waiting to hear back to see if they have any 1 or 1 1/4 inch pucks I can get for cheap. If not I'll order them.






Edit: They dont' have any they just want to sell the kit for 200 bucks lol Forget that :P
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Old 06-26-2011, 11:13 PM   #29
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Had the same problem with the overheating. Some of the guys here said an electric fan is useless compared to the stock unless your under water. The shop guys said the same thing and to keep the fan clutch. Bought a Transmission cooler with a small 300 cfm fan in front of it and that solved a lot of the problems. Poured in some Purple Ice too, but not sure if that really helped after the tranny fluid stayed out of the radiator. Mine did good on the city streets but ran 210 + on the highway.
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Old 06-27-2011, 10:37 AM   #30
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Got a link where I can get those replacement pucks at? There's a lift shop here in town I'm waiting to hear back to see if they have any 1 or 1 1/4 inch pucks I can get for cheap. If not I'll order them.
I found part of it. Dig around on there and you can find the 1" pucks for 2 bucks each.

http://www.performanceaccessories.com/


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