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Discussion Starter #1
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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Discussion Starter #4
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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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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Discussion Starter #7
I replaced the cap and the temp sending unit.
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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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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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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Discussion Starter #12
Okay, hopefully, its the pump then. I'll go ahead and replace that as well. Thanks for the info!
 

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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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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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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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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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Discussion Starter #17
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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Discussion Starter #18
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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Discussion Starter #19
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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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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