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Old 08-07-2011, 09:23 PM   #1
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Exclamation Newbie question about running hot while wheeling

I'll try to keep it short. I took my 98 Sport into the woods today, nothing tough, tight trails didn't even put it in 4wd. After about 30 minutes of wheeling, I noticed my temp gauge was higher than the norm of 210. We stopped for a few moments, then when I started the Jeep, it had a rough idle. We continued down the trail and everything seemed normal. (Going at a slow pace due to tight trails.) We made it back to the blacktop and stopped again to let everyone catch up. After about 5 minutes, I started the Jeep and again it had a very rough idle. I shut it down, opened the hood and checked my plug wires to see if any came loose. I let the Jeep sit for about 40 minutes with the hood up. When I started it, it had a smooth idle and ran down the road with no problems. Is this normal with Jeeps? The temp gauge on the trails stayed between the 210 mark and the white mark before red. (never went to red) I have a big ride next week about 50 miles away and don't want to run into any problems. Also, wanted to add that I had the soft top on with the doors off and had the a/c on. (This may sound crazy but the previous owner said they did this all the time, another reason I looked for a Jeep with A/C.) Never had any issues before with the A/C running, BUT I was on pavement not creeping in the woods.

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Old 08-07-2011, 10:20 PM   #2
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Ive had A/C on when not going fast as you need to stay cool. No issues here. Havent done it on the trails though.

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Old 08-07-2011, 10:28 PM   #3
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Ive had A/C on when not going fast as you need to stay cool. No issues here. Havent done it on the trails though.

I've ran the A/C before while riding some open trails (with all doors and windows up) and never had the idle problem before. I don't know if running the A/C with the doors off could cause it to run a little hotter.
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Old 08-07-2011, 11:59 PM   #4
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Possibly the thermostat going bad?
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Old 08-08-2011, 12:03 AM   #5
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I've ran the A/C before while riding some open trails (with all doors and windows up) and never had the idle problem before. I don't know if running the A/C with the doors off could cause it to run a little hotter.
Prob not the case as it isnt auto climate control. The vehicle isnt trying to compensate for more hot air in the vehicle.

Thermostat sounds like a good place to start. Also, how is your fluid/coolant/antifreeze level?
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Old 08-08-2011, 12:35 AM   #6
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i would start with the thermostat but i don't think it can cause a rough idle by itself. doors on or off will not affect the ac.
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Old 08-08-2011, 02:32 AM   #7
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seems to be a common issue with wranglers. there was another thread i read recently where this was discussed. i havent looked into this much since i havent had the problem myself but there may be some help here for you: http://www.wranglerforum.com/f5/roug...ac-104145.html
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Old 08-08-2011, 06:43 AM   #8
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seems to be a common issue with wranglers. there was another thread i read recently where this was discussed. i havent looked into this much since i havent had the problem myself but there may be some help here for you: http://www.wranglerforum.com/f5/roug...ac-104145.html

Thanks for the replies. After reading that thread, I'm going to check into cleaning the IAC.
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Old 08-08-2011, 10:29 AM   #9
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Just talked to local Jeep shop and they said it could be fan clutch going out and heat soak.
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Old 08-08-2011, 10:54 AM   #10
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Thermostat, then belts,then waterpump..I did it the hard way

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Old 08-08-2011, 11:14 AM   #11
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Ok, shop said they would start with a 3 core radiator since it only did this at low speeds in tight woods. Said it wouldn't affect temps at highway speeds but would see temp differences at lower speeds such as wheeling. Also recommended a new fan clutch and exhaust wrap during the change.
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Old 08-08-2011, 04:19 PM   #12
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Only question now after reading some threads, is a 3 core too much radiator for my jeep? Should I just replace it with an OEM 1 core or after market 2 or try the 3 core? It does get pretty darn hot and humid in Alabama.
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Old 08-08-2011, 04:38 PM   #13
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I have rockcrawled for hours on end in 110 degree temps with the AC blasting and have never seen any hotter than a needles width to the right of the 1 in 210. How much the humidity factors in I couldn't tell you as this was in the desert but the people that played out there as I did didn't have those issues until they started messing with the factory set up. Being you, I would look hard at my fan clutch first. You will be hard pressed to find better cooling than the oem one core as more cores equal smaller tubes.
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Old 08-08-2011, 04:51 PM   #14
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I have rockcrawled for hours on end in 110 degree temps with the AC blasting and have never seen any hotter than a needles width to the right of the 1 in 210. How much the humidity factors in I couldn't tell you as this was in the desert but the people that played out there as I did didn't have those issues until they started messing with the factory set up. Being you, I would look hard at my fan clutch first. You will be hard pressed to find better cooling than the oem one core as more cores equal smaller tubes.
That's what I'm thinking. Replace fan clutch and wrap the exhaust. (To cut down engine compartment temps.) Problem persists, then I'll start looking at other things I guess.
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Old 08-08-2011, 04:51 PM   #15
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Is it an automatic? Both the A/C condenser and transmission cooler would be sharing real estate with your radiator. At low speed AND low revs, the mechanical fan may not move enough air around the engine bay to keep all 3 cool. If you start to see the temp climbing at low speeds, try putting it in neutral and giving it just enough gas to get the revs to ~2k. If the temp drops, it's an air flow issue.

Try hosing all the mud/bugs out of your radiator as well.

And shut the A/C off and open the damn windows/doors when you're wheeling! You can get A/C at the mall later!
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Old 08-08-2011, 05:08 PM   #16
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And shut the A/C off and open the damn windows/doors when you're wheeling! You can get A/C at the mall later!
Dohhh. Good one. I normally do, but it got a little uncomfortable Sunday. That's why I'm hoping this is an isolated incident. Rather change small things first. Shoot, its a 98, better to be safe than sorry. Long trip coming up Saturday.
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Old 08-09-2011, 09:59 AM   #17
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You might look up what some call heat soak. When it is hot out and you have been running it and then shut it off heat can build up in the fuel rail that actually boils the fuel, when you start up again it idles rough for a little bit until that fuel is used up. I live in Oklahoma where it gets hot and humid and I will push 210 until I get it on the open road.
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Old 08-09-2011, 10:08 AM   #18
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You might look up what some call heat soak. When it is hot out and you have been running it and then shut it off heat can build up in the fuel rail that actually boils the fuel, when you start up again it idles rough for a little bit until that fuel is used up. I live in Oklahoma where it gets hot and humid and I will push 210 until I get it on the open road.
That's the diagnoses I'm getting. My normal running temp is 210. On that day it jumped between 210 and red zone in about 15 minutes of wheeling in the woods. But, once I hit pavement, it went back to 210. Going to experiment this weekend.
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Old 08-09-2011, 05:09 PM   #19
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Ok. I think it's time for a new fan clutch. Cranked up the Jeep and let it idle until it hit normal op temp of 210. Cut it off and turned the fan for about 3 minutes (back in forth in both directions) by hand. The fan had a little resistance but could easily be turned. (It didn't spin freely.) I checked the fan when it was cold and it had the same amount of resistance as hot. Also checked the radiator when it was cold and was full. Overflow looked good too. From the other threads about clutch fans, It looks like mine is bad. Next question is, where to get a good clutch? From the other threads people advise to stay from the local auto parts store. Any particular brand to shy away from?

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