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Old 06-05-2013, 08:39 AM   #1
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06 TJ says 210 deg but engine bay feels too hot

Friend recently got a 2006 TJ Unlimited (LJ) with 82k miles, temp gauge says 210, but if you open the hood the engine bay feels very hot. You can't even touch the two metal support/stiffener rods that run at an angle from radiator area to firewall area. And don't even think about touching anything on the motor.

Is this normal? Jeep seems to run just fine. I don't know when the last coolant flush was done or what condition the coolant is in, and haven't checked into the thermostat, as the gauge still reads 210.

What's the easiest way to read the coolant temp (other than relying on the gauge) immediately after shutting down the motor?

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Old 06-05-2013, 08:52 AM   #2
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210 is the normal operating temp for your 4.0L engine. I do not know of any vehicle that runs at 210 degrees F where the engine bay would not be too hot to touch in certain areas with your bare hands after it has been running a long time w/ the hood shut.

The only way to confirm your stock gage's reading is to install an additional, calibrated coolant temp sensor/gage, but I do not think that is necessary.

It's never a bad idea to flush and re-fill a cooling system on a used vehicle if you are not sure of the maintenance history, but based on your post, sounds like your Jeep cooling system is fine.

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Old 06-05-2013, 08:53 AM   #3
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fairly normal. cat converters may be clogged up/breaking down, but that should present itself with CEL. my underhood engine temps got very hot when pre-cats were going bad.
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Old 06-05-2013, 09:00 AM   #4
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I have an 06 LJ and it is very hot under the hood. The 4.0 just runs hot.
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Old 06-05-2013, 09:04 AM   #5
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Yep. The modern 4.0 is happiest at 210. Mine reads just a hair below the 210 mark, even after cutting big holes in the hood and installing a vented hood louver. But, I can feel tons of heat escaping out those vents now. Even though the motor is happy, everything else around it can't be. I am hoping the louver will help take away some of the heat soak trapped under the hood.
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Old 06-05-2013, 10:48 AM   #6
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That temp is uncomfortable for humans but for not the steel, plastic, & rubber components inside the engine compartment. Just like like the axle pumpkins are too hot to touch for more than a split second but everything inside is perfectly happy.

So what may feel too hot to a human isn't too hot for those types of items. We humans just have a very narrow comfort range of temperatures.
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Old 06-05-2013, 02:12 PM   #7
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This all sounds encouraging... thanks.

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