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Running Hot??

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Old Jul 29, 2012 | 04:06 PM
  #1  
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From: Centerton, AR
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Default Running Hot??

My ride seems to always be running hot. It runs at 210 while I am driving but when I stop at a light or sitting in traffic it will go up from there. It never reaches the red but steadly runs way up there while sitting. I have changed out the clogged radiator for a new radiator and also changed the thermostat. Water pump seems to work just fine. Everything else looks good. Any suggestions on other things that I should check?
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Old Jul 29, 2012 | 04:30 PM
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"Creeping overheat" at idle is a sign that your fan clutch is failing. Fans not blowing enough air past the radiator at a stop. Next time you're at that high temp in the picture, pop the hood and look to see if your electric fan is on (it's the black one on the right). It's supposed to come on at 218.
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Old Jul 29, 2012 | 04:33 PM
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Then shut it down and see if your mech fan keeps spinning.
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Old Jul 29, 2012 | 04:39 PM
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X2
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Old Jul 29, 2012 | 04:41 PM
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How would one tell if a "water pump is working fine"? The only thing one can tell from the outside is "it's not leaking". I believe this water pump was not leaking and obviously not working either....but u can't tell for sure 'til it's off.
Attached Thumbnails Running Hot??-water-pump-1-xj.jpg   Running Hot??-water-pump-2-xj.jpg  
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Old Jul 29, 2012 | 05:44 PM
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Yep I have done that. It does come on and stops when the vehicle stops. UPDATE: Actually I checked it a few weeks ago when I started diving into fixing this and it was shutting off when the vehicle shuts off. BUT today, it kept spinning.

Originally Posted by Muaddib420
"Creeping overheat" at idle is a sign that your fan clutch is failing. Fans not blowing enough air past the radiator at a stop. Next time you're at that high temp in the picture, pop the hood and look to see if your electric fan is on (it's the black one on the right). It's supposed to come on at 218.

Last edited by twm3000; Jul 29, 2012 at 06:09 PM.
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Old Jul 29, 2012 | 05:45 PM
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True...well its not leaking. The radiator shop told me it was fine. I was just taking their word for it. Do you think replacing it might be in order?

Originally Posted by djb383
How would one tell if a "water pump is working fine"? The only thing one can tell from the outside is "it's not leaking". I believe this water pump was not leaking and obviously not working either....but u can't tell for sure 'til it's off.
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Old Jul 29, 2012 | 05:48 PM
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Originally Posted by djb383
How would one tell if a "water pump is working fine"? The only thing one can tell from the outside is "it's not leaking". I believe this water pump was not leaking and obviously not working either....but u can't tell for sure 'til it's off.
I haven't seen a water pump that bad in a long time. A buddy of mine had a a Toyota that kept over heating and his pump look even worst then that one. Needless to say after we changed it out he had no more over heating problems.
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Old Jul 29, 2012 | 06:07 PM
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Actually I checked it a few weeks ago when I started diving into fixing this and it was shutting off when the vehicle shuts off. BUT today, it kept spinning.

Originally Posted by EZEARL
Then shut it down and see if your mech fan keeps spinning.
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Old Jul 29, 2012 | 06:12 PM
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Sounds like you have a bad fan clutch.
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Old Jul 29, 2012 | 06:44 PM
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Originally Posted by twm3000
True...well its not leaking. The radiator shop told me it was fine. I was just taking their word for it. Do you think replacing it might be in order?
I think if one doesn't know how old all cooling system components are, they should all be replaced asap. U've done the rad and t-stat and still overheat....just a little more time and "throwing money at it" (as some would say) for a new water pump and fan clutch and most likely your overheat problem will be solved. Since we're just blindly throwing money at the cooling system (I'm being facetious), how about a new rad cap and rad hoses.
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Old Jul 29, 2012 | 08:03 PM
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Actually already got the new rad cap too..haha

Originally Posted by djb383
I think if one doesn't know how old all cooling system components are, they should all be replaced asap. U've done the rad and t-stat and still overheat....just a little more time and "throwing money at it" (as some would say) for a new water pump and fan clutch and most likely your overheat problem will be solved. Since we're just blindly throwing money at the cooling system (I'm being facetious), how about a new rad cap and rad hoses.
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Old Jul 29, 2012 | 09:40 PM
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.....then water pump, fan clutch and hoses is about all that remains, git 'er done.
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Old Jul 30, 2012 | 12:46 AM
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Default overheating

when your jeep is running remove your rad cap and smell your coolent. If it smells like exhaust you have a bad head gasket or cracked head. Just make sure your coolent system is not hot when checking it. You can also use a compresion tester. Shouldnt have anything under 100 psi.
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Old Jul 30, 2012 | 05:37 PM
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Originally Posted by 2010442
when your jeep is running remove your rad cap and smell your coolent. If it smells like exhaust you have a bad head gasket or cracked head. Just make sure your coolent system is not hot when checking it. You can also use a compresion tester. Shouldnt have anything under 100 psi.
Ok a couple of new things to check out. Thanks.
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