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Unread 07-26-2011, 04:22 PM   #1
Deezul
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Temp ok or not?

2004 rubicon 103k miles. Jeep was running a bit hot,coolant boiled in overflow Changed out thermostat and replaced radiator cap. Scangauge reading is 240. This is after 70mph highway then slow traffic. Here is a pic of the regular gauge

So is that too hot? It is 90 out too. Should I not worry about it unless it hits red? I am guessing the scangauge is reading high. If not what should I do?

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Unread 07-26-2011, 04:32 PM   #2
MiddleT
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That's where mine runs. Just a tad over 210, and thats poking through the woods on a 100 degree day.
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Unread 07-26-2011, 04:42 PM   #3
sduncan
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Your Scangauge is probably just fine. It is well know that 03 and later gauges are not even close to what you'd call accurate. More like an idiot needle instead od a light....
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Unread 07-26-2011, 04:51 PM   #4
unlimitedlj
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Yea mine rins right there this time of year. Shoot it was 105 yesterday and today its 107. 4.0L's run hot all cast iron doesn't have the heat transfer that other engines do and not to mention its ran really lean from the factory for emissions.
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Unread 07-26-2011, 05:06 PM   #5
Curly5759
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My 97 will run with the needle a little further right, about the middle of the 0, and my scan tool will read 240 as well. I tried a new sending unit just to see if it is correct, no change. I don't have any overheat issues like boil over, but running that hot doesn't make me happy. Radiator is new, condenser clear, etc. Maybe it's a jeep thing.

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Unread 07-26-2011, 05:42 PM   #6
Michael
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Mine runs on the 210 dot all the time once it is warmed up. Depending on whether I'm at highway speeds or stop-and-go traffic it hits either extreme of the 210 dot but the needle never leaves it completely.
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Unread 07-26-2011, 06:26 PM   #7
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Quote:
Originally Posted by Deezul View Post
2004 rubicon 103k miles. Jeep was running a bit hot,coolant boiled in overflow Changed out thermostat and replaced radiator cap. Scangauge reading is 240. This is after 70mph highway then slow traffic. Here is a pic of the regular gauge

So is that too hot? It is 90 out too. Should I not worry about it unless it hits red? I am guessing the scangauge is reading high. If not what should I do?
yup 240 is too hot IMHO. My factory gauge acts the same way - really inaccurate under 250. I've also got a Scangauge to verify.

I can't run the A/C unless I'm going over 20mph constantly, otherwise I see the same hot running issues. been like that probably since new, at least since 25k miles. So far i've flushed the coolant system twice, installed a NAPA 195 thermostat (3mm larger oriface diameter than stock) and a Hesco High-flow thermostat housing. Also running an 1994 Ford Explorer 10-blade fan with a Hayden Severe Duty 2793 clutch...and testing the stock 5-blade fan with a Hayden Severe Duty 2791 clutch.

So far the mods have helped incrementally, and it stays cooler longer. it's harder to heat up, but it still does and will climb to 260 w/ CEL if I let it.
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Unread 07-26-2011, 06:57 PM   #8
Deezul
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Hmm. So it hasn't boiled again so I am thinking it might have been the cap. Replaced thermostat with a Stam. I'll keep an eye on it I guess. Not sure if there's anything else to do.
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Unread 07-26-2011, 06:59 PM   #9
TheGuyFromNJ
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In my 03 Rubi scan gauge reads 230-240 if idling with the AC on, turning off the AC allows it to cool. Been thinking about the exploder fan/clutch mod, just haven't decided if there is any real gain yet. Going down the road, I'm solid at 205*-207*.
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Unread 07-26-2011, 07:08 PM   #10
timberwolf0122
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I'm always 210, 215 tops even with AC and riving up a hill.
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Unread 07-26-2011, 07:13 PM   #11
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Quote:
Originally Posted by timberwolf0122 View Post
I'm always 210, 215 tops even with AC and riving up a hill.
are you watching the stock gauge or a scan tool thats reading the temp off the ECU?
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