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Unread 07-05-2014, 01:43 PM   #1
smartbomb
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Join Date: Jul 2014
Location: tallahassee, florida
Posts: 3
05 KJ overheating

just picked this up for my sons 1st car. hes had it less than a month and it got roughly 102k miles on the clock. I get a call that he is stranded at a friends house with steam coming from under the hood. I manage to get it home (3 mile drive) with the temp gauge not peaking over 3/4. I get it in the garage with a new thermosat and the upper/lower radiator hoses and also notice a hairline crack in the radiator. so I have replaced the radiator as well.

after 20-30 minutes at idle the gauge is at 1/2 and will start to climb if I hold it at 2000 rpm and will climb really fast if I drive 2 miles. I suspected the water pump but the heater gets very warm and both radiator hoses are hot to the touch. I also "think" the system has been bled of any air given I don't see any of the visual signs.

so now I am at a loss. I doubt the water pump is the culprit. I did notice today that the a/c clutch would cycle on/off about once every 5 seconds and I get no cold air from it. could the compressor be dragging down the motor and causing the heat issue? I am open to any suggestions

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Unread 07-05-2014, 02:17 PM   #2
TwoBobsKJ
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2003 KJ Liberty 
 
Join Date: May 2011
Location: Northern, OH
Posts: 582
Welcome!

It's common to install the thermostat backwards so that it is closing as the engine gets warmer rather than opening. Double check the 'stat to fix the overheating at higher RPM's.

As for the compressor, sounds like the AC system needs to be purged and refilled. But the compressor won't cause enough of an issue to cause your temps to rise as they have. And a word of warning: These engines don't like to be overheated and are prone to drop a valve seat in the #2 cylinder. Make take years or may happen next week

Check that 'stat and report back to us.

Bob

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- 3.7L, 42RLE, 4.10's, 4X Guard Trans skid, Factory Engine, T-case, Tank skids, Modded BoulderBars sliders, OME 927/948, Bilsteins, JBA A-Arms & 1/4" top plate, 1 extra rear iso/side, Moabs with Firestone Destination AT's 255/70-16
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Unread 07-05-2014, 02:34 PM   #3
smartbomb
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Location: tallahassee, florida
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will do. thanks
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Unread 07-07-2014, 05:43 AM   #4
smartbomb
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Join Date: Jul 2014
Location: tallahassee, florida
Posts: 3
T Stat was backwards!! doh! I guess getting aggravated with the stinking squeeze hose clamps made my brain turn to mush.

thanks for the help!
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Unread 07-08-2014, 06:08 PM   #5
TwoBobsKJ
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2003 KJ Liberty 
 
Join Date: May 2011
Location: Northern, OH
Posts: 582
Quote:
Originally Posted by smartbomb View Post
T Stat was backwards!! doh! I guess getting aggravated with the stinking squeeze hose clamps made my brain turn to mush.

thanks for the help!
Many others have done the same thing. A lot cheaper than other potential problems so sit back and enjoy the Jeep!

Bob
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2003 Renegade, Black
- 3.7L, 42RLE, 4.10's, 4X Guard Trans skid, Factory Engine, T-case, Tank skids, Modded BoulderBars sliders, OME 927/948, Bilsteins, JBA A-Arms & 1/4" top plate, 1 extra rear iso/side, Moabs with Firestone Destination AT's 255/70-16
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