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Old 12-10-2019, 09:08 PM
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overheating and it sucks

Decided Iíd make a post because Iím gonna be sitting in the median letting my Jeep cool down for the next 30 minutes.
Anyway, I went off-roading, lots of cool stuff lots of mud. My Jeep started overheating on the way home so I had it towed and then changed out the thermostat because I figured thatís what it was. Still overheated so today I drained the coolant and refilled it making sure there are no air bubbles in the system. Clearly that didnít solve my issue either. The gauge just steadily climbs to the red in about 10 minutes. Itís got the stock cooling system still but itís never had overheating problems and there are no leaks. Im gonna try and do possibly a new radiator tomorrow but Iím open for ideas.
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Old 12-10-2019, 09:15 PM   #2
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My money is on mud filled radiator fins.

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Old 12-10-2019, 09:15 PM
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My money is on mud filled radiator fins.


First thing I tried was hosing it off:/


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Old 12-10-2019, 09:21 PM   #4
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First thing I tried was hosing it off:/
Shoot the water front to rear/rear to front through the fins, don't just rinse the radiator off.
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Old 12-10-2019, 09:23 PM
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Shoot the water front to rear/rear to front through the fins, don't just rinse the radiator off.


Just like head on through the condenser?


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Old 12-10-2019, 09:44 PM   #6
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Impeller failed on water pump
All looks normal but no coolant circulation

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Old 12-10-2019, 09:45 PM
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Impeller failed on water pump
All looks normal but no coolant circulation

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I was thinking it might be the pump but when I turned it on to bleed the cooling system it popped up bubbles. How can I text if itís the pump?


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Old 12-10-2019, 09:47 PM   #8
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Disconnect a heater hose and see if it pumps out coolant
Some say you can just squeeze a hose but even without good circulation the heat builds some pressure as coolant expands


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Old 12-10-2019, 09:48 PM
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Disconnect a heater hose and see if it pumps out coolant
Some say you can just squeeze a hose but even without good circulation the heat builds some pressure as coolant expands


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Ok Iíll try this tomorrow but an FYI the heat does work as I was using it to frantically cool my engine so I feel like that means thereís flow but not sure.


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Old 12-10-2019, 09:54 PM   #10
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Stock cooling system is over 20 years old, might just be time for an overhaul.
You could do the fan clutch first, and if that doesn't solve it, water pump and rad at same time.
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Old 12-10-2019, 11:38 PM   #11
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As Jerry indicated get in front of the fan in the shroud and hose the crud out forward. I will ad at 20+ years old Im kinda surprised its lasted as long as it has. My 98's went at 65K miles and 7 years old. At some point the fan does little as the air from the speed of driving is greater which does the cooling. You've done the thermo, If its getting hot at speeds likely the radiator is seen better days. I have seen pump blades corrode away but thats typically a slow and progressively problem. Do make sure its burped 100% and that you haven't created some kind of coolant sludge mixing oddball types.
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Old 12-11-2019, 03:26 AM   #12
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If you keep your jeep out of deep mud, it will last longer....
If someone drove one of my jeeps into that shithole in ur avatar pic I would likely get violent....

X 10 radiator clogged w mud....
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Old 12-11-2019, 06:06 AM   #13
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Good info here. First things I'd check and clean is the radiator and AC condenser if equipped. Then fan operation. Next would be if the cooling system was properly bled. Then I'd remove the thermostat and be sure it opens at the right temperature. Finally the water pump as already mentioned. The radiator could be plugged up and require replacement, the vehicle is at that age where a cooling system overhaul might be in order.
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Old 12-11-2019, 07:17 AM   #14
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Flush rad with water from the inside out to remove dirt/mud. If it's not a clogged rad then replace the water pump and thermostat.
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Old 12-11-2019, 10:35 AM   #15
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if you keep your jeep out of deep mud, it will last longer....
If someone drove one of my jeeps into that shithole in ur avatar pic i would likely get violent....
x2.
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Old 12-11-2019, 05:29 PM   #16
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Before I learned about mud, I had one instance where my radiator was so clogged that I had to remove it to effectively clean it's fins and the condenser fins in the AC. Without removal, it would have never come clean. It took about an hour with a garden hose to finish the job.


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Old 12-11-2019, 05:30 PM   #17
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Mud like that is bad for a TJ especially recurrent mud encounters


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Old 12-11-2019, 06:51 PM   #18
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I've only had two encounters with deep mud in my TJ and neither were good or fun. I don't understand the attraction.
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Old 12-11-2019, 07:02 PM   #19
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LOL, we're in the middle of a late-fall mud season here in SW Colorado.

I avoid contact with it as much as I can, not easy out here on our gravel roads.

But then again, once in a while it warms up enough and dries out so I can do a nice hot water pressure wash on my concrete pad...
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Old 12-11-2019, 10:13 PM   #20
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Mud, only fun until you are stuck or have to clean it off your Jeep.
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Old 12-12-2019, 06:02 AM   #21
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Before I learned about mud, I had one instance where my radiator was so clogged that I had to remove it to effectively clean it's fins and the condenser fins in the AC. Without removal, it would have never come clean. It took about an hour with a garden hose to finish the job.


Good luck.




I see what the problem is.
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Old 12-17-2019, 07:19 PM   #22
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Before you put money in a new radiator, please open the two (input) & (output) heater hoses and flush through the heater core. Frequently that’s the source of poor circulation.
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Old 12-17-2019, 07:22 PM   #23
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Before you put money in a new radiator, please open the two (input) & (output) heater hoses and flush through the heater core. Frequently thatís the source of poor circulation.
A clogged heater core would have a lot to do with low heat output in the passenger compartment but very little to do with an overheating engine.
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Old 12-17-2019, 07:24 PM   #24
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Over heating and it sucks

[QUOTE=1998saharaGeorge;34616593]Decided Iíd make a post because Iím gonna be sitting in the median letting my Jeep cool down for the next 30 minutes.
Anyway, I went off-roading, lots of cool stuff lots of mud. My Jeep started overheating on the way home so I had it towed and then changed out the thermostat because I figured thatís what it was. Still overheated so today I drained the coolant and refilled it making sure there are no air bubbles in the system. Clearly that didnít solve my issue either. The gauge just steadily climbs to the red in about 10 minutes. Itís got the stock cooling system still but itís never had overheating problems and there are no leaks. Im gonna try and do possibly a new radiator tomorrow but Iím open for ideas.
1998 4.0 Sahara.


Sent from my iPhone using Tapatalk[/QUOTE


Most likely to be blocked radiator, most people look at the radiator for mud and debris. The near invisible problem is (muddy water) a fine coating of mud lines the fins then bakes on, although you can see through the fins checking for the obvious "MUD" this thin coating has a smothering effect.
So after going thru muddy water it needs to be blasted out as soon as possible. From Australia Beerwah bash.
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Old 12-17-2019, 10:27 PM   #25
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Simple cause/effect here

Quote:
Originally Posted by 1998saharaGeorge View Post
...
I went off-roading, lots of cool stuff lots of mud. My Jeep started overheating on the way home ...
If you got there without your rig overheating, then got muddy, then it started overheating... it's obvious cause and effect, not just a coincidence.

We bought my son's '99 in 2011 with 185k on the clock and still mostly stock cooling system. Dude we bought it from had recently replaced the radiator, but it overheated on my 100 mile drive home. Did some troubleshooting and eventually found the culprit...
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Old 12-18-2019, 10:32 AM   #26
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It should be best practice that when you replace a cooling component at higher mileage, you should go ahead and perform an entire overhaul (hoses, belts, tstat, water pump, radiator, flush core, etc..). It sucks doing the same job twice.

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