at it again!!!!!!!!!!!!!!!!!!!!!! - JeepForum.com

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post #1 of 73 Old 06-20-2013, 08:13 PM Thread Starter
homerx
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1993 ZJ 
 
Join Date: Sep 2011
Location: centereach
Posts: 176
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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post #2 of 73 Old 06-20-2013, 10:17 PM
JeepNicholson
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1996 ZJ 
 
Join Date: Apr 2013
Location: Burbank
Posts: 753
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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post #3 of 73 Old 06-20-2013, 10:19 PM
dnuccio
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1995 ZJ 
 
Join Date: Jul 2012
Location: Phoenix
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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?

Reliability is relative
R.I.P. Ratmonkey
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post #4 of 73 Old 06-20-2013, 10:57 PM
zander21510
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1995 ZJ 
 
Join Date: Jun 2011
Posts: 2,138
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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post #5 of 73 Old 06-20-2013, 11:25 PM
wood04
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1998 ZJ 
 
Join Date: Feb 2013
Location: Erie
Posts: 36
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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post #6 of 73 Old 06-21-2013, 03:27 AM
eagsc7
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1994 ZJ 
 
Join Date: Apr 2013
Location: Sweetwater Cyt
Posts: 433
What sensors did you get? Are the Mopar? I'm thinking a bad sensor...
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post #7 of 73 Old 06-21-2013, 03:57 AM
angry_trucker
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1998 FSJ Cherokee 
 
Join Date: Feb 2013
Location: kitchener
Posts: 136
Is it possible, that you might have some air bubbles in the coolant?

98 Jeep Grand Cherokee Laredo 4.0
Selec-Trac
Everything stock.
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post #8 of 73 Old 06-21-2013, 04:10 AM
Technohead
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1998 ZJ 
 
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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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post #9 of 73 Old 06-21-2013, 06:25 AM
Syncityj
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1998 ZJ 
 
Join Date: Apr 2013
Location: Henderson
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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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post #10 of 73 Old 06-21-2013, 06:44 AM Thread Starter
homerx
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1993 ZJ 
 
Join Date: Sep 2011
Location: centereach
Posts: 176
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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post #11 of 73 Old 06-21-2013, 07:40 AM
um7267
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1998 ZJ 
 
Join Date: Jan 2013
Location: Grove City
Posts: 430
add an e-fan? ha it may help but wont stop the over heating, which temp sensor did you replace?

2004 Lexus Es330, alive; 1999 Cherokee Sport
1998 Grand Cherokee, sold
1997 Grand Cherokee; Black and Gold, Limited 4.0....RIP 2005
to the good times and the bad, the family we have and lost, little brother 1988-2011
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post #12 of 73 Old 06-21-2013, 08:00 AM
gs69350
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1998 ZJ 
 
Join Date: Aug 2012
Location: Sellersburg
Posts: 327
Do you have a fan shroud??

1998 Jeep Grand Cherokee 5.9 Limited - Stone White - Stock for now.
http://www.facebook.com/groups/59limited/ <-- 5.9 Owner's group on FB.
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post #13 of 73 Old 06-21-2013, 08:04 AM
brewcity1
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2004 WJ 
 
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Location: Milwaukee
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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.

2004 Grand Cherokee Limited 4.7L
General Grabber AT2's 255/65/17
1" Addco rear sway bar
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post #14 of 73 Old 06-21-2013, 08:34 AM Thread Starter
homerx
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1993 ZJ 
 
Join Date: Sep 2011
Location: centereach
Posts: 176
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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post #15 of 73 Old 06-21-2013, 08:42 AM
PolkaPower
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1998 ZJ 
 
Join Date: Aug 2011
Location: The Abyss
Posts: 19,372
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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