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Old 08-18-2010, 12:45 PM   #1
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Hot stuff!

Ok so I am wondering why my motor in my jk is so hot, not just off roading but any time really this thing is roasting hot. Anyone else's that way? My guage is always fine & the only time the temp guage moves is if I have the air on & need to climb something steep on the freeway for an extended time say a couple of mile. What can I do to cool it down somewhat apart from expensive mods? I don't think it should be quite as hot under the hood as it gets

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Old 08-18-2010, 12:52 PM   #2
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Old 08-18-2010, 12:58 PM   #3
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Oh I have already fitted a tranny' cooler ,with all the talk about the transmission overheating & all, I got one of those, this is the motor I am talking
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Old 08-18-2010, 01:04 PM   #4
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Maybe you could put some hood vents or louvers in...that might help cool the engine compartment some
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Old 08-18-2010, 01:50 PM   #5
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In the old days of carb'd engines and ROOMY eng. compartments--

The engines ran better at 180/190 degrees F

Since the mid 90's with new antifreeze's for the rad and ever increasing emission requirements, the op temp has climbed, so

All the vehicles now op at 200/220 degrees and the fan thermo's don't even switch on till after 215°--

If you've got the auto aux cooler -thats about the best you can do, your motor is alright-join the crowd !!

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Old 08-18-2010, 01:56 PM   #6
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Ok I am afraid to ask this as I dont want to offend but when you say the temp guage nevers moves, where is it when you first start up in the morning? and where does it settle down to after it warms up?
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Old 08-18-2010, 02:10 PM   #7
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you're talking about the temp inside the engine bay?

if so, no worries. your temp gage measures temps inside the engine. once you're up to operating temps it doesn't matter unless you've got a CAI. when your Jeep is moving it's actually alot cooler under the hood than you think. it's like driving topless. even at 90 degrees, it doesn't feel hot till you stop. the engine is the same way.

she's running at 198-200 degrees. that's normal. now when you stop at a traffic light on a hot day, you'll notice the temp climb. sometimes to 230. that's your intake sucking in all that hot air. but as soon as you start moving, the temp drops. even 90 degree air moving will cool things down nicely.

I guess what I'm trying to say is it's ok. we're only worried about internal, oil, and coolant temps. the only time that bay temp becomes an issue is in traffic, or off-road when it's real hot out. you risk overheating due to the lack of air-flow so the intake sucks in hot air, not giving engine oil or coolant a fighting chance. the cooling system in a JK is pretty good though. snorkels draw air out near the windshield, so it's difficult to overheat engines equipped with them.

don't worry too much though. as soon as you hit 15mph all that hot air I think you're talking about blows out under the Jeep, and cold air (90 outside vs 190 under the hood) replaces it quickly.
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Old 08-18-2010, 02:13 PM   #8
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Quote:
Originally Posted by Bondgreg
Ok I am afraid to ask this as I dont want to offend but when you say the temp guage nevers moves, where is it when you first start up in the morning? and where does it settle down to after it warms up?
where it settles on my JK (right in the middle) is 200. according to my programmer, we operate 198-205. stopped I've gotten as high as 240 on a 95 or so degree day, but she dropped to 205ish in a couple miles.
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Old 08-18-2010, 02:29 PM   #9
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Yeah' the temperature is always dead center of the guage unless like I said in the first post happens & then it goes up a few notches. Sounds like I have nothing to worry about & I usually notice the heat when I go to check something under the hood after driving it so it's plenty hot then. (& of course the weather is pretty hot here as well) thanks guys, I feel like a dork sometimes asking those sort of questions so appreciate your help
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Old 08-18-2010, 02:40 PM   #10
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Yeah itll be fine at 200 on the road. If you are worried off-road get an electric fan. They work wonders. Yo.
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Old 08-18-2010, 02:46 PM   #11
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I too felt like you did when I first got my JK. The temp needle was right in the middle which I was not used to as my old Titan was a little more that half of half and so sits the needle in my Accord.
I had a hard time accepting that it was normal for it to be in the middle but got used to it.
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Old 08-18-2010, 03:05 PM   #12
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I was the same way in my Jaguar it ran at around 170. It stayed cool and it was a 4.0 I6 putting out 280hp and 340lbs it was like arrow too super sleek with two electric fans.
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Old 08-18-2010, 03:16 PM   #13
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Quote:
Originally Posted by JIMBOX View Post
In the old days of carb'd engines and ROOMY eng. compartments--

The engines ran better at 180/190 degrees F

Since the mid 90's with new antifreeze's for the rad and ever increasing emission requirements, the op temp has climbed, so

All the vehicles now op at 200/220 degrees and the fan thermo's don't even switch on till after 215°--

If you've got the auto aux cooler -thats about the best you can do, your motor is alright-join the crowd !!

JIMBO

You get the best burn on 87/89 Octane fuel at about 210°F. You get more horsepower when the engine is colder, but i guess this is "their" way of uping fuel economy

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