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Unread 06-20-2013, 08:13 PM   #1
homerx
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1993 ZJ 
 
Join Date: Sep 2011
Location: centereach, ny
Posts: 163
at it again!!!!!!!!!!!!!!!!!!!!!!

hi jeep forum. i really need ur help. in other posts i was asking about an over heating problem. well i pulled out my wallet and got a whole new cooling system, and installed it 2 weeks ago. the problem is its still over heating.
she would over heat to about 215 at idle and when driving but after 40 or so miles on a hot day it will creep up to 230 and hold there even at idle and slowly creep down. around town it holds at 215.


list of things done:
new cooling sensors
new water pump (and before u ask i did check to see if it was a reserves flow its not)
new radiator
new super duty fan clutch
new t stat (changed it 4 times, 2 were 195, 2 were 180, and i have a 180 in there now)
bled the system and burped it

i have absolutely no leaks anywhere, heat as hot as hell.
runs fine no hick ups or anything. but i am getting an o2 sensor problem and a code 52 which is running rich, and my mpg on highway depends on how hot she gets.

i seriously am lost!!!!!!!!!!!!

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Unread 06-20-2013, 10:17 PM   #2
JeepNicholson
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1996 ZJ 
 
Join Date: Apr 2013
Location: Burbank, OH
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Check me on this, or maybe I misunderstood, but isn't it supposed to have a reverse flow water pump? Last time I did one I remember it having a R stamped on it.

Oh yeah and I remember reading somewhere here before that the lower temp thermostats can trick the computer into running a bit rich, but again, check me on that. Just some ideas.
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Unread 06-20-2013, 10:19 PM   #3
dnuccio
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gauge might be off. mine is off by around 50 degrees according to a matco infrared thermometer shined at the cylinder head. yes i know the sensor reads the temperature of the coolant not the cyl head, but i would think the head would be hotter than the coolant, no?
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Unread 06-20-2013, 10:57 PM   #4
zander21510
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I'm sure you probably have with all the stuff you have done but have you flushed the block? Backwards and forwards?

Other than that I can't see what would be the problem other than a bad gauge.
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Unread 06-20-2013, 11:25 PM   #5
wood04
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I tried aftermarket thermo clutches for the fan and heavy duty or reg didn't cut it compared to the mopar tow package one. the dealer one was the only one that worked on mine.
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Unread 06-21-2013, 03:27 AM   #6
eagsc7
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What sensors did you get? Are the Mopar? I'm thinking a bad sensor...
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Unread 06-21-2013, 03:57 AM   #7
angry_trucker
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Is it possible, that you might have some air bubbles in the coolant?
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Unread 06-21-2013, 04:10 AM   #8
Technohead
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All ZJ's I've owned have normally run at around 220. Fluctuating between 215 and 230 does not sound like a problem to me.
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Unread 06-21-2013, 06:25 AM   #9
Syncityj
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Quote:
Originally Posted by Technohead
All ZJ's I've owned have normally run at around 220. Fluctuating between 215 and 230 does not sound like a problem to me.
I run up to 230 on a hot day with the a/c running and idling. My girls '06 TJ runs at 210 all day everyday.
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Unread 06-21-2013, 06:44 AM   #10
homerx
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Well idk about flow so ill look that up later but I know that in the past the teuck ran at 180- 195 all day every day. This problem just started happening recently. And I don't have mopar sensors but I don't use autozone stuff eather. The brand is called standard. Its an oem made part. Idk if tha makes a diff.
And I did flush both ways and heater core too.
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Unread 06-21-2013, 07:40 AM   #11
um7267
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add an e-fan? ha it may help but wont stop the over heating, which temp sensor did you replace?
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Unread 06-21-2013, 08:00 AM   #12
gs69350
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Do you have a fan shroud??
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Unread 06-21-2013, 08:04 AM   #13
brewcity1
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Quote:
Originally Posted by Technohead View Post
All ZJ's I've owned have normally run at around 220. Fluctuating between 215 and 230 does not sound like a problem to me.
^^^ Same here! 9er runs 220 about all the time with a 195 thermostat and a new waterpump....creeps back to around 210 when driving steady.
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Unread 06-21-2013, 08:34 AM   #14
homerx
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I don't think a e fan would really help.
I replaced both temp sensors one behind alt and the other behind a/c compressor.
Mine runs hotter when driving on highway then in park.
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Unread 06-21-2013, 08:42 AM   #15
PolkaPower
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Quote:
Originally Posted by homerx View Post
I don't think a e fan would really help.
I replaced both temp sensors one behind alt and the other behind a/c compressor.
Mine runs hotter when driving on highway then in park.
The 93-95 have a sensor for the gauge and one for the PCM. The 96+ have only one for both. It will give a false reading if it's bad and possible cause the motor to run rich or learn depending on how it fails.
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