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Old 08-03-2019, 04:43 PM
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TJ Overheating

Hi everyone.
I have an 02 i6 wrangler that has been overheating. I have replaced the thermostat, radiator, clutch, and fan yet it still overheats. I can even get it to overheat at idle if I leave it running for 20 minutes. It has 85k on the engine. The water pump is not leaking. Once the engine is at 210, it continues to slowly creep up. Once it hits around 230 it jumps up into the red and the check cluster light pops up.

I did a pressure test on the cooling system and it did lose a little bit of pressure but that was over a 10-15 minute period.

Thanks,
Clark

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Old 08-03-2019, 04:57 PM   #2
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Radiator cap /seal cap to radiator till proven otherwise


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Old 08-03-2019, 05:02 PM
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I replaced the cap and the temp sending unit.
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Old 08-03-2019, 07:49 PM
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Here is a list of everything that ha been replaced.
Radiator
Rad Cap
Temp sending unit
thermostat
fan clutch
fan
Got all the air out of the system and it still overheats.
Any ideas? Could it be the head gasket? Manifold Gasket?
Thanks
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Old 08-03-2019, 08:19 PM   #5
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If you are infact overheating still after installing a slew of new parts, even at idle. Water pump makes the most sense. That probably would have been the best place to focus on first, given the symptoms.

You can always confirm the temperature with an infrared thermometer to rule out a faulty temp sensor.

Was there any fine metallic build up in the old radiator? Water pumps dont always weep when they have failed.
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Old 08-04-2019, 12:53 AM   #6
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What brand radiator, cap, and thermostat?
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Old 08-04-2019, 12:09 PM
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Originally Posted by JeepTJs View Post
I replaced the cap and the temp sending unit.
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Originally Posted by Mattaeus View Post
If you are infact overheating still after installing a slew of new parts, even at idle. Water pump makes the most sense. That probably would have been the best place to focus on first, given the symptoms.

You can always confirm the temperature with an infrared thermometer to rule out a faulty temp sensor.

Was there any fine metallic build up in the old radiator? Water pumps dont always weep when they have failed.
Would a water pump just stop working? It couldn't have seized up because it has been my daily driver for weeks with no overheating issues and there are no coolant leaks. Everything is dry in my engine bay. I just figure a bad pump would either seize up or the bearings would go bad and it would start leaking?. I'll double-check the temp by using one of those infrared thermometers. I have not noticed any metallic buildup. The old coolant was clean. I'll take a closer look tho.

Thank you,
-Clark
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Old 08-04-2019, 12:15 PM
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What brand radiator, cap, and thermostat?
I bought the Mopar radiator,
I believe the thermostat was a murray.
Radiator cap is 18 psi murray.
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Old 08-04-2019, 03:13 PM   #9
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It's never a bad idea to flush the entire cooling system: engine block, heater core, radiator, and coolant lines when diagnosing an overheating condition that appears to be due to something other than a faulty thermostat or other obvious condition.
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Old 08-04-2019, 03:24 PM   #10
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Originally Posted by JeepTJs View Post
I bought the Mopar radiator,
I believe the thermostat was a murray.
Radiator cap is 18 psi murray.
That's good that you stuck with the Mopar rad.

The water pump impeller could be damaged, if coolant flushes are not done regularly, sometimes they can get corroded and eaten away
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Old 08-04-2019, 04:50 PM   #11
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TJ Overheating

If the impeller blades corrode away in a water pump it is neither seized or leaking but it is not circulating coolant like it should

Scroll to bottom here
https://www.knowyourparts.com/techni...ailure-points/


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Old 08-05-2019, 02:59 AM
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Okay, hopefully, its the pump then. I'll go ahead and replace that as well. Thanks for the info!
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Old 08-05-2019, 05:14 AM   #13
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Regarding replacing thermostats and radiator caps to "fix" overheating issues. I suggest only using OE parts, not aftermarket. I learned that the hard way. Even though a company like Stant might make OE thermostats, the specs might be slightly different for OE. This info was passed along from a very reliable and respected source years ago. Flame suit on. Another thing often taken for granted when servicing or replacing cooling system parts is being certain the cooling system is properly bled.
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Old 08-06-2019, 09:29 PM   #14
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Do you have the tupy head? My 2000 acted just like yours, even after replacing entire cooling system with all Mopar parts. Could be a head/ head gasket issue ....
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Old 08-07-2019, 07:14 AM   #15
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You've gotten good replies. I'd suggest doing a tool loan from AZ or wherever to sniff for exhaust gases at the radiator cap first. It's going to be either a head gasket leak or water pump.
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Old 08-09-2019, 11:32 AM   #16
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I had a 1998 Sahara, with the online six. 234,000 miles! Put on belts, hoses, brakes wear items and one alternator which went bad when it was under water too long! But I drove it daily. One morning I left for work, it was 10° F. I travelled maybe two miles and it ran hot and the motor shut off before I could pull over. I got it to crank after a few minutes and limped it back home. The internal impeller shaft had broken inside the water pump. Never made a noise, belt number turned loose, and I only found the problem after disassembling the water pump.
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Old 08-09-2019, 11:14 PM
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You've gotten good replies. I'd suggest doing a tool loan from AZ or wherever to sniff for exhaust gases at the radiator cap first. It's going to be either a head gasket leak or water pump.
Yeah we tried doing that already. Where you put the tool where the radiator cap is and u allow the gasses to pass through the tool. If there is a leak the liquid in the tool should change color however it. Ever changed color. So that’s a good sign. We ordered the mop at pump and are waiting for it’s arrival.
Thanks
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Old 08-09-2019, 11:15 PM
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Do you have the tupy head? My 2000 acted just like yours, even after replacing entire cooling system with all Mopar parts. Could be a head/ head gasket issue ....
Idk what head we have. I assume it’s not a tupy tho. We already did some tests that would cross out a cracked head or bad head gasket. Hopefully it’s the water pump if it’s not, then we pretty much know what it is.
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Old 08-09-2019, 11:18 PM
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I had a 1998 Sahara, with the online six. 234,000 miles! Put on belts, hoses, brakes wear items and one alternator which went bad when it was under water too long! But I drove it daily. One morning I left for work, it was 10° F. I travelled maybe two miles and it ran hot and the motor shut off before I could pull over. I got it to crank after a few minutes and limped it back home. The internal impeller shaft had broken inside the water pump. Never made a noise, belt number turned loose, and I only found the problem after disassembling the water pump.
Okay, idk if the belt is lose but this is promising. I didn’t think the impeller could break. I’d understand if it wasn’t driven daily and it corroded. I just want to get my Jeep back on the road. I’m stuck driving an old Mercedes station wagon : /
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Old 08-10-2019, 10:12 AM   #20
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I have seen where people have put the thermostat in backwards. They could never figure why it would over heat and it was because it could not flow.

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Old 08-10-2019, 10:21 AM   #21
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Make sure you installed the serpentine belt correct. I believe the TJ water pump rotates in the opposite direction than 90 percent of other water pumps.
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Old 08-10-2019, 11:16 AM   #22
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If you want to evaluate water pump performance, disconnect the heater hose from the water pump and run the engine. If coolant flows enthusiastically from the hose, the water pump has to be working. (Use a clean bucket and test with a cold engine.)
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Old 08-10-2019, 06:40 PM   #23
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This thread is a gold mine for future people looking for ideas to chase down a problem. Nice job forum.
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Old 08-11-2019, 12:15 AM   #24
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I have had this problem and one thing I did was get a Laser Thermometer. It helped me just double check the temperature. It turned out my Jeep was not overheating but the gauge was reading wrong.
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Old 08-11-2019, 07:39 AM   #25
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Originally Posted by Digger84 View Post
If the impeller blades corrode away in a water pump it is neither seized or leaking but it is not circulating coolant like it should

Scroll to bottom here
https://www.knowyourparts.com/techni...ailure-points/


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I had one on another vehicle corrode to the point the tips on the impeller were all completely gone. Looked exactly like a pizza cutter and was just as effective! Moved no coolant whatsoever. Never found out until the pressure release started blowing steam on the highway.

JeepTJs: You can easily confirm one way or the other, whether you have the redesigned TUPY head or not...
Take oil filler cap off and look inside. If you have a TUPY head, you will see it stamped in the casting. See photo as example...
Maybe you are lucky enough to already have it.
Good luck!
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Old 08-18-2019, 06:40 PM
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Update: Put the new pump in yesterday and that seemed to fix the problem. I took a look at the old pump and found that the issue was that only one side was spinning. I will explain this the best I can. The side of the water pump that the belt turns was turning (obviously) however, the inside did not turn. Both sides of the water pump moved freely, however, they also moved independently from each other. Anyways, since I replaced the pump it has not overheated. Thank you for all the help!
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Old 08-18-2019, 06:44 PM   #27
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Good thing you caught that!
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Old 08-18-2019, 06:49 PM   #28
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Sounds just like what the pointed out in the link

“Impeller slippage in shaft
The less common water pump failure is the impeller slipping on the water pump shaft. A good water pump impeller will cause the pressure to increase as the engine is accelerated. If pressure does not increase, the impeller is slipping on the shaft or is missing impeller blades. In general, a good water pump should develop at least 10 psi of pressure above 2,000 rpm.

Since the impeller and shaft are a press-fit assembly, slippage occurs most frequently on remanufactured water pumps. In any case, *slippage can be intermittent in nature and can depend greatly upon the temperature and speed of the engine.”

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Old 08-19-2019, 10:56 AM   #29
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