Hello. I have a 2012 JKUR. Auto, 4.10s with some mods. 33x13.5x17 MTs, bumpers and front winch. No lift.

Once I'm at normal operating temps, and put the jeep under load (most noticeable when going up hills) the temp starts to go up. Depending on the size of the hill it'll get as high as 248F or the 3/4 mark on the gauge (that was a big steep long ass hill). But its regularly going to 229F-233F on even smaller hills. The dealer has replaced the thermostat, and 'checked' everything else out, and determined that there's no issues and no codes. Other than the fact that the temp gets a lot hotter than it should.

Anyway Chrysler came back and blamed the issue on the fact that I have oversized tires. Which is a crock. Unfortunately none of my friends has any stock tires that I can borrow for a day or two to prove them wrong. Am still looking into this.

Also, I've noticed that I'm getting a burnt smell when I put the jeep under load that's unrelated to my temp (temp can be at 150F and smell is still there). I'm also going through coolant. Went through over 4L on my 7000km road trip last month (~4800 miles).

I'm due for an oil change any day now... how can one check for coolant in synthetic oil?

Basically the dealer has told me that since Chrysler has determined that it's an issue with the tires, they've stopped looking into the issue. There's only 1 dealer withing about 1000 miles of me. Taking it elsewhere isn't an option. This is the dealer I purchased the JK from, and typically has been very good to me re warranty (at least on my last JK).

Other than finding stock tires to prove everyone wrong... any one else have any idea's?

Thanks.

 

What's your engine rpm while going up hills? Is your transmission kicking down to 4th or 3d?

 

How much does the winch obstruct the air flow through the grill? Any lights in front of the grill?
(Picture available?)

 

I'm absolutely certain it's not an airflow issue, as it will happen even when in 4hi going up a hill on the trail, it's occasionally happened in 4lo, however that's been very rare. RPMs are not high... It's when the engine is having to work. RPMs are under 3k (I cruise at 60 at ~2300). It's more noticeable (temps go up faster) if I step on it going up a hill - RPMs around 4k, but going up very slow with the RPMs around 2-2500 doesn't make a difference if the hill is long enough.

 

Is ur fan broken?

 

The temp rises in my 2012 with Manual Trans under load as well, but it has never "overheated". I stays within a reasonable range.

I assumed it was normal, but I had an 07 and the temp did not rise as noticeably under similar conditions.

My assumption is that it is a normal characteristic of the 3.6?

Anyone know better?

 

No, fan works perfectly. Kicks into high when it should (apparently that's at 212F - so says 1 dealer).

 

I have friends with a 2013 and the temp gauge doesn't move any more than my 07 did - which was not at all. Maybe a hint to the right... but when mine goes warm, I'm talking almost 3/4 of the way across the gauge. Which in my mind is not normal. Also, I was told that the 2012 manual says 230F is considered to be overheating. 230F is barely a peg to the right of where mine normally operates (basically vertical, 207-222F).

Anyone else with a 2012+ going through coolant? Also, how do I check to see if there's coolant in my oil (I'm due for an oil change fairly quickly).

 

make sure you have enuff engine oil and tranny fluid. being low on either can cause temps to rise in the drive line. check the coolant level, make sure it is pressurized and all is functioning properly with no leaks. make sure your fan runs at both speeds. is your radiator dirty? dirty air filter? how about the engine, tranny etc? dirty=heat build up. also the temp gauges have been known to go bad and cause false readings. if everything else checks out, im guessing its that or a bad water pump.

 

Oil levels are good (I don't burn any oil). Coolant levels, I'm constantly checking, and constantly topping up (seem to be going through a lot of coolant). New air filter. Engine isn't clean by any stretch, but neither is it filthy. Rad is very clean. Tranny seals were replaced mid trip (they were 'sweating'), and didn't have any effect either way.

If it wasn't for the occasional slight smell of something burning (that doesn't correspond with the temp rising), I could perhaps see it as being a faulty temp sensor (I have a digital gauge plugged into the CPU that goes up & down with the gauge). But I honestly believe there's something wrong going on.