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Old 07-24-2012, 09:07 PM   #31
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Originally Posted by Daginni
Well, changed out the Thermastat, and decided to drive it around a bit. Started cool, and steadily rose to 210F on road after about 10 minutes or so. Decided to full blast the AC, still 210F. Decided to off-road a bit, still says 210F, maybe just a hair higher.

But the question is, should the outside of the engine feel like it's hot. Not glowing or anything dangerous, but it defiantly feels like 210F on the outside of the engine. Hood is warm as a result. Normal?

Fan is running, engine sounds perfectly fine, everything is operating like it should. I only owned this Jeep for half a year, never went around other Jeeps to see their engines heat, and honestly unsure what to expect from a 4.0L Engine. It's probaly nothing, but better safe than a busted head gasget or radiator.

Going to flush the Coolant tonight because I should do it anyways.

Never went past 210F even with old Themastat. Heck, I dont even think there was anything wrong with the old one, but replaced it anyways.
Yes the outside of the engine should be hot and so should the hood. Mine runs 210 or a little over if I'm towing or wheeling. You have nothing to worry about.

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Old 07-24-2012, 10:47 PM   #32
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Use a HOAT coolant and if you mix your own, be sure to only use distilled water. Zerex G-05 coolant would be an excellent choice.
x2 on this
x3 on this

FYI the only place I found around me that was selling Zerex G-05 was Napa. I got 4-5 different auto stores around me and that was the only one.

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Old 07-24-2012, 11:29 PM   #33
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Same here but I usually go to napa anyway
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Old 07-31-2012, 06:33 PM   #34
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My temp has been acting up. Normaly it's around 210 but today after a 75 mile drive it went to the red zone and the check gauges light came on. After letting it cool down it stayed around 220 while driving. I give up with this hunk of garbage Jeep. 5 years of problems has been enough for me.
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Old 08-02-2012, 02:05 PM   #35
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Mine got up to about 220 or so yesterday. Temps were high 90s/low 100s and I had the air on. I was also driving on I-44 thru the Ozarks with a stiff head wind.

Lost some fluid out of the overflow cannister, but nothing else. Rad is still full and topped off the overflow this morning.

Looks like it's going to be in the 100s all this week and next in OKC.
---

Yesterday My jeep also ran about 220 but It didn't over heat at all.. I passed by the car wash spend a dollar and wet it down then drove it on home. It was about 113 degrees outside I was driving down lake hefner pwky from memorial to nw 63rd expressway.. The traffic was kinda heavy but it didn't give me any problems. Since I had it, it always ran 210 ALWAYS! This is the first time that I ever seen it go over, but then again it's the first time that I drove through HELL in Oklahoma tripple degree heat! I never.. Anyway is there anything I can do to make my Jeep Desert Ready? there hasn't been any rain here and doesn't ever look like it's going to rain. I love my A/C so a dunebuggy is out. Is this normail in tripple degree heat that is my question. I thought something was wrong with my jeep, but it drove fine and didn't ever give me any problems. Owned it for 6 years 1998 Jeep Cherokee sports. I thought about stopping and pouring some beer on the radiator, but said Nahh... lol Let me know thanks.. From Long Island NY.. Drove jeep here.. BTW Just replaced A/C condenser, compressor, waterpump, this that.. so I don't think anything is wrong with it.. Air is nice and cold..
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Old 08-02-2012, 02:17 PM   #36
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Yesterday My jeep also ran about 220 but It didn't over heat at all.. I passed by the car wash spend a dollar and wet it down then drove it on home. It was about 113 degrees outside I was driving down lake hefner pwky from memorial to nw 63rd expressway.. The traffic was kinda heavy but it didn't give me any problems. Since I had it, it always ran 210 ALWAYS! This is the first time that I ever seen it go over, but then again it's the first time that I drove through HELL in Oklahoma tripple degree heat! I never.. Anyway is there anything I can do to make my Jeep Desert Ready? there hasn't been any rain here and doesn't ever look like it's going to rain. I love my A/C so a dunebuggy is out. Is this normail in tripple degree heat that is my question. I thought something was wrong with my jeep, but it drove fine and didn't ever give me any problems. Owned it for 6 years 1998 Jeep Cherokee sports. I thought about stopping and pouring some beer on the radiator, but said Nahh... lol Let me know thanks.. From Long Island NY.. Drove jeep here.. Repalce all A/C parts , New Waterpump, and I keep my oil Changed every 3. new here, trying to find out how to post also.. thx for ur patients.
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Old 08-02-2012, 02:20 PM   #37
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My temp has been acting up. Normaly it's around 210 but today after a 75 mile drive it went to the red zone and the check gauges light came on. After letting it cool down it stayed around 220 while driving. I give up with this hunk of garbage Jeep. 5 years of problems has been enough for me.
There is no such thing as an incurable overheating problem. Overheating is caused by any or a combination of the following... clogged radiator, defective thermostat, air in the cooling system, defective fan clutch, bad radiator cap, improper coolant/water ratio, or a bad water pump. It's a simple system, it doesn't take much to fix an overheating problem... and in proper operating condition, the TJ's OE cooling system will keep the engine cool in any conceivable driving condition.
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Old 08-02-2012, 02:44 PM   #38
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there is no such thing as an incurable overheating problem. Overheating is caused by any or a combination of the following... Clogged radiator, defective thermostat, air in the cooling system, defective fan clutch, bad radiator cap, improper coolant/water ratio, or a bad water pump. It's a simple system, it doesn't take much to fix an overheating problem... And in proper operating condition, the tj's oe cooling system will keep the engine cool in any conceivable driving condition.
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Old 08-02-2012, 05:42 PM   #39
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210 is my normal, with Heat Index of 110 outside.

Of course I can practical fry a burger on my hood after a long drive. Gotta love Black in the Florida sun.
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Old 08-02-2012, 05:55 PM   #40
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210 here as well. I work at a Jeep dealership and my techs tell me 210 is the norm for these beasts.
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Old 08-02-2012, 06:08 PM   #41
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Originally Posted by stephenmathies

---

Yesterday My jeep also ran about 220 but It didn't over heat at all.. I passed by the car wash spend a dollar and wet it down then drove it on home. It was about 113 degrees outside I was driving down lake hefner pwky from memorial to nw 63rd expressway.. The traffic was kinda heavy but it didn't give me any problems. Since I had it, it always ran 210 ALWAYS! This is the first time that I ever seen it go over, but then again it's the first time that I drove through HELL in Oklahoma tripple degree heat! I never.. Anyway is there anything I can do to make my Jeep Desert Ready? there hasn't been any rain here and doesn't ever look like it's going to rain. I love my A/C so a dunebuggy is out. Is this normail in tripple degree heat that is my question. I thought something was wrong with my jeep, but it drove fine and didn't ever give me any problems. Owned it for 6 years 1998 Jeep Cherokee sports. I thought about stopping and pouring some beer on the radiator, but said Nahh... lol Let me know thanks.. From Long Island NY.. Drove jeep here.. BTW Just replaced A/C condenser, compressor, waterpump, this that.. so I don't think anything is wrong with it.. Air is nice and cold..
Whens the last time you replaced the tstat?
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Old 08-02-2012, 07:16 PM   #42
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There is no such thing as an incurable overheating problem. Overheating is caused by any or a combination of the following... clogged radiator, defective thermostat, air in the cooling system, defective fan clutch, bad radiator cap, improper coolant/water ratio, or a bad water pump. It's a simple system, it doesn't take much to fix an overheating problem... and in proper operating condition, the TJ's OE cooling system will keep the engine cool in any conceivable driving condition.

Ok so.
I have replaced my thermostat... went with a 180.
Replaced my Radiator. All aluminum.
Replaced my Fan. Flexlite electric with manual cut off for deep water use.
Replaced my Exhaust. Highflow system.
Cleaned AC condenser.

Before I did all of this my jeep would OVER heat.. all the way to red.. If i sat at idle for more than 7 min.

now it sits at 220 most of the time...
should i replace the water pump...

when I flushed the system (before I replaced the radiator) i did not see anything that made me think the system was dirty...


Also... when I start it on a hot day it does not allways want to start...
I turn the key on and wait about 20 seconds and it starts fine....
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Old 08-02-2012, 07:24 PM   #43
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The OE radiator core was already all aluminum and electric fans simply don't cool as well. You haven't replaced the water pump but you replaced everything else?

And a 165 or 180 degree thermostat has nothing to do with helping an engine run cooler on a hot day. Lower temp thermostats only prevent an engine from warming up fully or very quickly on cold days.
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Old 08-03-2012, 07:05 PM   #44
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Jerry. Yes I replaced everything but the water pump.
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Old 08-03-2012, 07:14 PM   #45
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Jerry. The core was but the tank on top was plastic and cracked.
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Old 08-03-2012, 07:19 PM   #46
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Jerry. Tstat has nothing to do with engine cooling???? Not sure why you say that. Correct me if I am wrong but if your tstat gets stuck closed then no water will flow. No water flow means that you overheat.
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Old 08-03-2012, 10:26 PM   #47
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Jerry. Tstat has nothing to do with engine cooling???? Not sure why you say that. Correct me if I am wrong but if your tstat gets stuck closed then no water will flow. No water flow means that you overheat.

True, but that doesn't happen often. More and more, t-stats are being built so that if they fail, they'll fail open. The danger there is that the engine will never make it to operating temps. If the t-stat is too cool, then extremely low temps may keep the engine from warming all the way up.
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Old 08-03-2012, 11:15 PM   #48
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The lower stat opening temp will just keep your jeep in open loop longer especially in the winter. That's not really a good or bad thing but sorta pointless IMO...you might notice a hit on your mpg until your engine gets to running temp too.

So you're still running hot? Before you put in a new pump make sure the system is holding pressure. When at running temp the upper hose should be hard...if it's easy to squeeze there isn't any pressure. Put on a new radiator cap if you haven't already, they're cheap, and make sure the upper and lower hose clamps are tight. My system wasn't holding pressure even with a new cap so I replaced the stock pinch clamps with worm clamps and now it does.
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Old 08-04-2012, 10:42 AM   #49
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Jerry. Tstat has nothing to do with engine cooling???? Not sure why you say that. Correct me if I am wrong but if your tstat gets stuck closed then no water will flow. No water flow means that you overheat.
U misread wat he said. Those specific lower temp. Tstats dont help run the engine cooler. It still runs the same temp the tstat just opens at a lower temp.
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Old 08-04-2012, 12:03 PM   #50
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Ok System is holding pressure.
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Old 08-04-2012, 12:06 PM   #51
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Jerry. You are right. I did misread you. Sorry about that.
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Old 08-07-2012, 05:26 PM   #52
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i had an overheating problem when my a/c was on so i replaced my thermostat with an oe thermostat and now i have a check engine light for engine running to cold for to long. what could have caused this
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Old 08-10-2012, 12:14 PM   #53
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i had an overheating problem when my a/c was on so i replaced my thermostat with an oe thermostat and now i have a check engine light for engine running to cold for to long. what could have caused this
Did you get the correct t-stat? Maybe it is faulty?
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Old 08-10-2012, 12:20 PM   #54
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Went on a 5 hour drive a few days ago and with the AC on and it being about 105* out, my temp got to about 220 and stayed there. All other times its 210. Just had cap replaced and system flushed. Any reason to worry?
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Old 08-10-2012, 12:57 PM   #55
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Went on a 5 hour drive a few days ago and with the AC on and it being about 105* out, my temp got to about 220 and stayed there. All other times its 210. Just had cap replaced and system flushed. Any reason to worry?
I was towing the other day and it was around 90 out and mine was running at 220ish, it usually will run there when towing and offroading in hot conditions, 210 in regular conditions. My overflow actually boiled over that day as well, I think I fixed the issues, coolant to water ratio was off.
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Old 08-10-2012, 12:58 PM   #56
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i had an overheating problem when my a/c was on so i replaced my thermostat with an oe thermostat and now i have a check engine light for engine running to cold for to long. what could have caused this
That could only be caused by if you installed a defective thermostat or a lower temperature model thermostat than the factory specified 195 degree model.
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Old 08-10-2012, 01:03 PM   #57
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I was towing the other day and it was around 90 out and mine was running at 220ish, it usually will run there when towing and offroading in hot conditions, 210 in regular conditions. My overflow actually boiled over that day as well, I think I fixed the issues, coolant to water ratio was off.
Getting hot enough to boil overflow into the overflow is usually caused by a defective or incorrect radiator cap. Our TJs require an 18 lb. pressure model radiator cap.
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Old 08-10-2012, 01:30 PM   #58
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My TJ runs 195 all the time, no matter how hot, when I'm driving around the city. However, if I get on the highway and I'm running 60-70mph, in 100+ temps, it will creep up to 210+, but not much more. I did a 7 hour drive in 106+ temps, with AC on Max, at 70mph and it stayed around the 210 level the whole time, but would quickly drop down if I slowed down to 55mph (or stopped and idled). I don't view this as anything abnormal....it's damn hot out. My thermostat is new, rad cap is new, fully flushed system.
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Old 08-11-2012, 10:31 AM   #59
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'97 2.5, auto, A/C, runs just below 210 all the time, in traffic or highway when it is cold or hot outside, even in 100+ degree temps and A/C blasting.
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Old 08-11-2012, 01:01 PM   #60
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Are there any options to upgrade with a different than stock radiator to keep temps lower?

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