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 Post subject: Overheating on hills with A/C
PostPosted: Wed Jul 17, 2013 9:08 am 
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Joined: Tue Mar 16, 2010 11:56 am
Posts: 152
Location: Montclair, NJ
Hello Guys,

I'm having some weird issues with my KJ as of late.

This happened before and after i swapped the water pump recently.
On hills, 3000rpm+ with A/C on she'll overheat. kill the A/C she'll stop overheating.

Tstat, hoses and radiator are all original, fan works OK, currently at 160k miles.

Should i swap the radiator, tstat and hoses? nothings leaking at the moment, coolant looks good, no signs of oil in the coolant or vice versa.

Any thoughts?


Thanks!

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'04 KJ Sport SOLD 1/2017
Frankenlift II Baja + JBA Arms
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245/75/16 BFG Mud Terrain KM2's on MOABs
Renegade Lightbar
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'84 CJ-7, 4.56s, Yukon Shafts, ARBs F&R, 4.5" BDS, 33x10.5r15, M8000.
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'13 Chevy Silverado 2500HD Z71 6.0L -- Stock and staying that way!


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 Post subject: Re: Overheating on hills with A/C
PostPosted: Wed Jul 17, 2013 10:54 am 
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Joined: Mon Oct 20, 2008 4:24 am
Posts: 1520
Location: Australia
Flow test the radiator there have been a few cases lately of crud build up blocking core flow. Hope you have been running HOAT


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 Post subject: Re: Overheating on hills with A/C
PostPosted: Wed Jul 17, 2013 3:50 pm 
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Joined: Fri Apr 14, 2006 2:44 pm
Posts: 178
Location: Fremont CA
Make sure your fan runs consistently with the a/c on. It might work intermittently and not keep your radiator cool enough.

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 Post subject: Re: Overheating on hills with A/C
PostPosted: Tue Jul 23, 2013 4:43 pm 
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Joined: Wed Apr 07, 2010 7:45 am
Posts: 37
Location: Moscow, Rus
About year ago i had overheating troubles with my crd on speed about 80 mph: even with heater turned on to max temp i have got 3/4 on dashboard and needed to slow down to decrease the temperature. I dont say about traffic jams - it was impossible to use a/c. Then i removed all of radiators and cleaned them with the karcher.

Now i have dead electric fan (suppliers dont have it in stock and i have to wait) but even without working electric fan i drive 95 mpg with 90 F outside and a/c turned on and my coolant temp sensor shows less than half.
So just try to clean your radiators first


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 Post subject: Re: Overheating on hills with A/C
PostPosted: Sat Aug 10, 2013 1:30 pm 
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Joined: Thu Dec 17, 2009 7:51 pm
Posts: 248
I had a similar problem and it turned out to be an intermittent radiator fan.

Sent from my DROID RAZR using Tapatalk 2

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2003 Liberty Renegade
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 Post subject: Re: Overheating on hills with A/C
PostPosted: Wed Aug 21, 2013 2:37 pm 
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Joined: Wed Apr 07, 2010 7:45 am
Posts: 37
Location: Moscow, Rus
So the 1.5 year was passed and i again had troubles with transmission looked like overheating. When i disassembled all radiators and intercooler i sow the same picture - all the central parts of radiators was really very dirty. Mosquitoes and other dirt covers most part of surface. So liqui moly cleaner and karher - and all the troubles is gone. You have to clean it first before to try all other possibilities i think.


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 Post subject: Re: Overheating on hills with A/C
PostPosted: Thu Aug 22, 2013 5:32 pm 
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Joined: Mon Jan 01, 2007 11:41 am
Posts: 687
Location: Canada
SENT wrote:
So the 1.5 year was passed and i again had troubles with transmission looked like overheating. When i disassembled all radiators and intercooler i sow the same picture - all the central parts of radiators was really very dirty. Mosquitoes and other dirt covers most part of surface. So liqui moly cleaner and karher - and all the troubles is gone. You have to clean it first before to try all other possibilities i think.

I strongly agree. After recently cleaning my rad I've noticed an improvement.

sent from my Galaxy SIII & Tapatalk4 beta

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