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Old 09-24-2012, 09:38 AM   #1
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Heater in JK

So on my '11 JKU with hard top, I had to run the heat on high to stay comfortable. It got the job done, but it certainly did not run me out of the Jeep like a furnace. And I'm not the type of guy who likes it HOT in the vehicle either. I just want to get my hands warmed up and knock the chill off the air.

This new '12 JKU with soft top is apparently going to be even worse. It was about 37 degrees outside this morning, and with the temp. dial all the way to the right it never did get warm inside the Jeep. It did get comfortable, but not really warm. When it dips down to 0F this winter, it looks like my passengers are going to freeze.

What's the deal with these JKs? On my '92 YJ, the heater would get so hot that you had to keep it on the lowest setting or you'd start sweating.

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Old 09-24-2012, 09:43 AM   #2
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I ran this morning in my '12 with the top off in 42 degree weather- - windows up, heater on 3/4 full fan, temp all the way up, mix between floor and main vents. Drove for 40 mins at 45-55 mph and kept pretty warm...with the top on I would of been super hot. Get a thermometer and put it in your vents to check the temp...I've never done it but maybe others on here know what the temp should be

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Old 09-24-2012, 09:55 AM   #3
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Something's wrong.

The JK heaters are known to be brutally hot. On even the coldest NC mornings (low 20s maybe) with only a soft top I can't run it full blast for more than a few minutes--it's painful.
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Old 09-24-2012, 09:56 AM   #4
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Zero problem staying warm in my 2011 JKU...heater works great. Took my daughter to school this morning (39 degrees) with the soft top up, windows off, and we were toasty 5 minutes after pulling out of the driveway...Never been a problem in New England winters....
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Old 09-24-2012, 09:58 AM   #5
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I keep my temp set to 70 and the fan set to "auto" and it works great.
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Old 09-24-2012, 10:19 AM   #6
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My '08 got warm enough to keep coffee hot.

Is it possible that you suffer from peripheral neuropathy?


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Old 09-24-2012, 10:29 AM   #7
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I drove doors on & top off in my 2013 JKU Sport and it was incredibly hot this morning. Now if you are in the back seats you may be cold. but the front was plenty warm. I did put on a ski cap for my ears....
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Old 09-24-2012, 10:41 AM   #8
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Make sure the a/ c button (pushing the temp control) is off. It doesn't shut off automatically when changing to heat from a/c.
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Old 09-24-2012, 10:42 AM   #9
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Sounds like I've had two odd JKs in a row. I've owned dozens of vehicles over the past 10 years, including an old Wrangler, and I've never had this issue before on any other vehicles. I'll grab a thermometer and check the air temp coming from the vents.
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Old 09-24-2012, 11:14 AM   #10
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The heat on my 07 gets crazy hot compared to the TJ I used to have. The JK get pretty hot quick to the point I have to turn it down or it gets uncomfortable.
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Old 09-24-2012, 11:44 AM   #11
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Yup, quick warm up on both of my JKs and plenty of heat.
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Old 09-24-2012, 12:31 PM   #12
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Quote:
Originally Posted by MTH View Post
Something's wrong.

The JK heaters are known to be brutally hot. On even the coldest NC mornings (low 20s maybe) with only a soft top I can't run it full blast for more than a few minutes--it's painful.
I'm going with this. I can count the # of times I had to even put it on high. It gets real hot.
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Old 09-24-2012, 12:37 PM   #13
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yeah, the heating on my jeep is better than any other vehicle i've had. i'm pretty sure i could cook breakfast with it.
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Old 09-24-2012, 12:47 PM   #14
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OK, so I cannot find any specs on what the temp. coming from the vents should be. But in the TJ forum, some guys said theirs was running around 140 degrees with the heat on high.

So now it's 60 degrees outside (warmed up pretty quickly from this morning) and I put a thermomter on top of the vent and ran the heat on high for 15 or 20 minutes after driving the Jeep to get the coolant to full temperature, and the best I could get out of my vents is 114 degrees.

If it's putting out 114 with a warm ambient temp, then this morning in the 30s ambient it was probably lower. That a significant difference from what the TJ guys were seeing. I wish I could find actual JK specs.

Looks like I'll add this to my list of things to inquire about next time I'm at the dealership. I should have asked when I had my '11...it was the same way.
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Old 09-24-2012, 01:30 PM   #15
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Quote:
Originally Posted by MTH View Post
Something's wrong.

The JK heaters are known to be brutally hot. On even the coldest NC mornings (low 20s maybe) with only a soft top I can't run it full blast for more than a few minutes--it's painful.
Pretty much this.
 
The heater in my 2012 Unlimited is crazy hot, like I'm trying to figure how they exhaust the heat from the nearest nuke plant hot.
 
The passengers can get some love too, you just need to point the center vents towards the rear and use those to get some initial warmth in the back and then switch to floor vents.
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Old 09-24-2012, 01:35 PM   #16
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114 seems low. i'll try measure mine tonight. when mine's on max i can't keep my hand in front of it.
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Old 09-24-2012, 03:23 PM   #17
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Definitely sounds like something isn't right. I haven't used the heat since last winter on my 2012 but I can say worked extremely well back then. So well that it would burn my hands if I left it on max heat.
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Old 09-24-2012, 03:29 PM   #18
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I don't know how hot, but the heater in my 12 COOKS. Not once did I have a hard time last winter with my soft top. Even in below zero temps I was toasty.

114 does sound low. Your under warranty, have the dealers fumble around with it.
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Old 09-24-2012, 03:40 PM   #19
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Yes my 12 is like "liquid hot magma"! Can't hold your hand in front of it.
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Old 09-24-2012, 03:41 PM   #20
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Quote:
Originally Posted by Blastek View Post
114 seems low. i'll try measure mine tonight. when mine's on max i can't keep my hand in front of it.
Same here.
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Old 09-24-2012, 04:09 PM   #21
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Honestly, it might just be you. My family always makes the joke I'm cold blooded, because I am ALWAYS cold, so when I put my JK on blast heat I feel like its not enough when in the middle of winter.
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Old 09-24-2012, 04:12 PM   #22
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Quote:
Originally Posted by MTH View Post
Something's wrong.

The JK heaters are known to be brutally hot. On even the coldest NC mornings (low 20s maybe) with only a soft top I can't run it full blast for more than a few minutes--it's painful.
Quote:
Originally Posted by Climber07 View Post
Zero problem staying warm in my 2011 JKU...heater works great. Took my daughter to school this morning (39 degrees) with the soft top up, windows off, and we were toasty 5 minutes after pulling out of the driveway...Never been a problem in New England winters....
Quote:
Originally Posted by Hilldweller View Post
My '08 got warm enough to keep coffee hot.

Is it possible that you suffer from peripheral neuropathy?


Quote:
Originally Posted by Blastek View Post
yeah, the heating on my jeep is better than any other vehicle i've had. i'm pretty sure i could cook breakfast with it.
Quote:
Originally Posted by dougharry72 View Post
Yes my 12 is like "liquid hot magma"! Can't hold your hand in front of it.
^^ These. Mine'll cook bacon. In fact, one day after I installed my ORH top last February, I went out on a 30 day with the top off, and STILL never moved the dial much past the halfway point. Got a lot of funny looks from peeps in traffic, but I was comfy.

Then again, 30 in February is St. Croix weather, for us.
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Old 09-24-2012, 04:23 PM   #23
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Mine 2010 gets real hot i always ask people who ride with me when there cold if they want it "hell" or "elderly" last time i checked temp it was like 170 coming out of the vents
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Old 09-24-2012, 04:38 PM   #24
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It was 11 here this morning, and with 2 minutes running from remote start i could feel the heat and within another minute my knuckles were melting.
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Old 09-24-2012, 05:45 PM   #25
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Sounds like the OP has a wonky thermostat.
Staying open or something ---- do vehicles even have thermostats anymore?
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Old 09-24-2012, 05:48 PM   #26
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Thermostats are still standard equipment. LOL
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Old 09-24-2012, 06:33 PM   #27
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The heater in my 12' JKU is inferno hot. I went fishing one evening with the tops off, and ended up staying until midnight. It dropped to 40 deg F outside, and running home with the top off I got a chill and turned on the heater for the first time. Within a minute, I had to keep my hands away from the vents to keep from getting burned, and worked up a sweat. I wonder if you have a thermostat issue?
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Old 09-28-2012, 03:08 PM   #28
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I just took my '12 JKU in to the dealer yesterday because the heat was room temperature at best. They called today and said that the heater core needs replacing. During the engine casting process, they didn't clean all of the sand out of the block before assembly, and this has caused major blockages in the heater core that can't be resolved by numerous flushings. It seems to be a fairly common occurance due to the manufacturing process.
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Old 09-28-2012, 03:12 PM   #29
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I would have it checked. JK are known for the volcano heaters. I run my JK with the Trektop NX windows out and a duster on up until snow hits the ground sometimes. Just turn the heat on and it keeps me warm even without rear windows
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Old 09-28-2012, 03:35 PM   #30
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Quote:
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114 seems low. i'll try measure mine tonight. when mine's on max i can't keep my hand in front of it.
Ditto. Never have had a vehicle that gets this hot, and it does it fast. Why would a different JK not get this hot? EDIT: Never mind, I now see at least two possibilities.

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