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Old 04-05-2013, 06:40 PM   #1
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Overheating w/ ac on

I had an issue with my Jeep over heating after some heavy mudding awhile back which thanks to some helpful ppl on here it just turned out to be my mud covered radiator. After cleaning it out several days in a row it ran normal ever since. I normally don't use my a/c so I didn't notice until recently that when I run it the temp gauge rises to almost the third mark where normally in the past it's always been dead center and still is if my a/c is off. I'm also having to add water/coolant every week but there is no apparent leak. I took it to Chrysler and they did a high pressure test of the radiator and say they see nothing wrong and could not explain it, of course when they ran the air it did not rise. Seems not to happen if idle, only when moving, but if I turn off the air it does not matter how fast I am going it stays perfectly in the middle. I am unsure what to do at this point. Also even though the gauge is at the third mark, which seems pretty high, I never see any steam and have only smelled the vaguest scent of coolant, and still never see any signs of a leak. Any advice would be greatly appreciated, thanks!

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Old 04-05-2013, 08:09 PM   #2
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Is your fan working?

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Old 04-05-2013, 08:56 PM   #3
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Quote:
Originally Posted by dieselgiant View Post
Is your fan working?
Yes, the fan seems to be working fine, it does kick on when I turn on the a/c but the temp gauge still rises.
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Old 04-06-2013, 12:35 PM   #4
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So nobody else has had similar issues to this?
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Old 07-09-2013, 05:59 PM   #5
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I just had the same issue while picking up my daughter. I ran inside (not even 3-4 minutes) left the Jeep running with air on as I live in South Georgia and didn't want it to be 1000 degrees when I put her in the back. I got in and noticed the gauge was steady climbing and then shot over to the red. I immideatly turned engine off and pulled into nearest parking lot. Luckily I was not far from the daycare so I walked her back over while I looked at the Jeep.

I let it cool off filled it back up with coolant and it is running fine as long as I don't turn on the A/C. The belt recently has started to squeal a little bit in first gear when I take off and the A/C is on. Anyone have any ideas of what could be causing this issue? I have to have the A/C for when my daughter is in the Jeep. I have a 99 4.0

Thanks!!
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Old 07-09-2013, 06:00 PM   #6
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Sorry just noticed this is the JK forum....
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Old 07-09-2013, 06:43 PM   #7
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You had mud in the radiator fins and hosed them out...did you check the A/C condenser mounted in front of the radiator??? If that is clogged up, the system runs at extremely higher temps and that puts a load on the radiator. Also you didn't mention if you are running an Auto or a Manual tranny. The Auto has it's cooler inside the radiator and if you are low on fluid, the tranny runs hotter and transfers the heat to the radiator. Just some other factors to consider. If you do a lot of mudding, suggest you check with your fellow Jeepers to see what they have installed in front of their radiators to help ward off the build up of mud and debris.

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