Jonny K's JK

Sorry to hear your issues, I've had this happen on my Chev 3500 454 and my 3.8L Jeep. Heater core was plugged off which restricted the flow of coolant partially. Lots of posts on the forum about flushing the heater core in reverse, doesn't take long and worth a shot. 3.6 is known to plug with casting sand
Let us know!

if you can read this, my Jeep is broken....

hannad

Well here is a final update. I had the fan settings adjusted by a local tuner as suggested by @rmswrangler and the temp gauge is now rock solid in the middle. I drove to Ouray 2 weeks ago and only on the most intense uphill slogs did it it even move beyond center. Watching the Temps with my scan tool it shows running right around 212-215. Thanks everyone for the help. Huge shout out to Clint at American Intense Racing http://www.ai-racing.com/

Septu

Due to an oil pump issue that came up recently... when the dealer drained my oil to change the oil pump, they noticed a lot of metal in the oil (there was only 2.7L of oil in the engine and it looked like a very nice and shiny metallic - dealer did an oil change 3 months ago when they replaced the PCV (?) valve). Fortunately the tech is very diligent and noticed this so he pulled the oil pan to look into it further - where he noticed a lot of metal slivers and shavings in the oil pan. He's attempting to get Chrysler to replace my engine under warranty. He thinks he'll be successful. I'll hopefully find out tomorrow how that's going.

If it happens, I guess we can find out if my temp issues were something to do with that engine, or just due to shitty fan controls as rsmwrangler posted.

I also wonder though who I could take the jeep to, to change those settings?

Septu

So a new engine was ordered today (under warranty). I guess we'll find out in 2-3 weeks what effect (if any) this will have on my temp issue.

Shaneps86

Hey Septu, Any progress on the engine replacement yet? Curious to know if this is an inherent issue of certain castings of the engine itself (as this is what I am suspecting) I have had all the same issues as you and the dealer has replaced all items in the cooling system, shy of the heater core. If this is the issue for you I will have the dealer take an oil sample and send it in for evaluation to look for metal.

SF_E60

I have a 2012 JKU (Sahara) w/ about 83k miles. I've never had any overheating issues at all since purchasing at 41k miles. I had my thermostat replaced about 1 month ago had a small crack. Today while coming back from camping the temp outside was about 98 degrees. I was on the 5 freeway coming back from camping going through (grapevine). I'm running 35's and 3.73 gears. My temp gauge moved a little past the half way mark going up hill. I was doing 76-78 and rpms were around 4k. This occurred for about 1min then it moved back to the middle. I'm pretty sure this is not normal.

When I got home checked overflow tank and coolant. Everything looked okay. I'm trying to figure out what might have caused this. Any ideas what else I can check?

casamtb

Check the oil filter is rated correctly. Had a similar issues. A trip this year. Same symptoms that it would over heated in hills on highway. Took it to dealer and they said the lube shop I took it to didn't fit the filter correctly and it caused the oil filter out of the filter to have too low a pressure. They said it common for oil change quick shop not to fully engage the double seal filter on the had and they see it a lot. Maybe.

SF_E60

Thanks for the reply. I've been taking it to a independent reputable shop for over 1yr never had any issues. Hoping it's a simple as the issue you had.

SF_E60

This would explain why I was seeing my temp gauge slight move past the mid way point going up the grapevine. It must have been around 103 degrees outside. I'm running 35's tires w/3.73 gearing. The dealer told me something similar, gauge is not 100% accurate.

Telldanny

I regeared from 3.73 to 4.56 and a diablo tune on my 2012 jku. It now never goes past half way Ever!!! The fans run more often with the 91 octane diablo tune and also gets better fuel economy. 18mpg. Problem solved. 3.5 inch lift and 35 inch tires.