4.0 engine temperature - could/should I make it cooler? - JeepForum.com
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post #1 of 4 Old 06-03-2012, 08:04 AM Thread Starter
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2003 TJ Wrangler 
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4.0 engine temperature - could/should I make it cooler?

My 03 Rubicon runs a little to warm for comfort (around 212). Around town it's not a big deal at all and usually stays around the 210 mark, but when I hit the interstate it can get up to 215 which isn't very comforting. So could/should I make her run a little cooler? What would be an advantage/disadvantage to doing so?

It probably doesn't help that I live in south Louisiana... But let me know what you think!

03' Rubicon Tomb-Raider running 4.88 with BFG MT 35s 4" Rubicon Express lift
Who doesn't love putting the throttle down?..
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post #2 of 4 Old 06-03-2012, 09:42 AM
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Those are very normal operating temps. Other than periodic normal maintenance (e.g. coolant flushes) I wouldn't touch it unless something is obviously wrong (e.g. dripping water pump). Stock cooling system is easy to screw up with "improvements".
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post #3 of 4 Old 06-03-2012, 11:30 AM
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2004 TJ Wrangler 
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I'm not real sure of the exact spread of the re lather range but I know all the jeeps I've seen atleast from 2000-2004 run dead on in normal conditions at 210 on the dot. It may be your fan shroud, your coolant mixture isn't propper, your thermostat is sticking slightly not allowing full flow, timing may be slightly off or fan clutch is failing. Radiators that get scale in them and fan clutches not working properly are a common cause and these r two things I have delt with quite a few times over the years.
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post #4 of 4 Old 06-03-2012, 11:35 AM
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Oh and I live in South Texas where temps are near 100* most of the year and unless I'm driving in real soft deep sand in four high for long periods it doesn't move off 210*. Not saying u actually have a prob just stating how mine and a handful of other jeeps in this year range run at.
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