Page 1 of 2 12 LastLast
Results 1 to 10 of 19

Thread: JK overheating then not

  1. #1
    Fresh Catch GeoWillys's Avatar
    Join Date
    Apr 2017
    Location
    Ohio
    Posts
    16

    JK overheating then not

    I have a 2015 JK that over a period of a week started having the temp gage hitting the 3/4 mark when normal driving on a cool day. No engine lights or anything else but I have two 2015 JKs which I have owned since new and have never seen the gage go over 1/2 way. Dropped at dealer and they say they cannot duplicate the issue, everything checks good. Anyone had this issue.

  2. #2
    Hooked Hilop's Avatar
    Join Date
    Feb 2015
    Location
    Fontana
    Posts
    131
    Try replacing the thermostat and burp the system. I also had a radiator leak at the seam where the plastic and metal meet.

  3. #3
    Old Timer wjtstudios's Avatar
    Join Date
    Nov 2016
    Location
    Rochester, MI.
    Posts
    4,224
    Have you tried flushing the system and replacing the fluid? A blockage could create fluctuating temps just like air in the lines can.


    Sent from my iPhone using WAYALIFE mobile app
    2015 JKU Rubicon AEV JK350
    1985 Jeep CJ8 Scrambler

  4. #4
    Fresh Catch GeoWillys's Avatar
    Join Date
    Apr 2017
    Location
    Ohio
    Posts
    16
    Yeah I think that is probably a good starting point. They wont change the thermostat because they did not get the thermostat discrepancy code or whatever, boneheads. I am going to do both JKs in one felled swoop. Thanks for the reply.

  5. #5
    Meme King WJCO's Avatar
    Join Date
    Sep 2015
    Location
    Colorado
    Posts
    26,786
    You can check thermostat operation yourself with a temp gun laser. Measure temps on both sides to make sure it's opening.

    Also, next time it's acting up, make sure your fan is working.
    Jeep parts and accessories purchased through the following link will help support this forum and at no cost to you.
    RECOMMENDED JEEP PARTS & ACCESSORIES



    Support the JL forum: JLWRANGLER.COM

  6. #6
    Fresh Catch
    Join Date
    Feb 2019
    Location
    Denver
    Posts
    1

    JK overheating - 2013

    Similar issues...

    Bought my JKU new
    4.88’s
    37’s
    4” Teraflex lift
    Front and rear eLockers

    Suddenly at 69k started to run hot. Now it overheats on long gradual climbs at ~3k RPM’s

    Replaced: thermostat twice (196 and then a 180 degree), thermo housing, water pump, temp sensor, radiator cap (tried a new 16psi and a 18 psi), installed new aluminum radiator. Flushed twice and properly burped the cooling system each time

    Drives fine until steady uphill moderate climb then overheats instantly. Today overheated and boiled over out of overflow tank driving to lunch.

    Any suggestions from here are surely welcome!!!

  7. #7
    Fresh Catch
    Join Date
    Dec 2014
    Location
    Chicago, IL
    Posts
    3
    I am fairly new to the JK platform (coming from having an XJ for the last 9 years). My XJ had a partially clogged radiator that had similar symptoms. It would idle fine, but when put under load it would run hot. After I installed a new radiator it ran great. Good Luck!!

  8. #8
    Guy with a Red 2-Door cozdude's Avatar
    Join Date
    Mar 2013
    Location
    West Chester, PA
    Posts
    18,474
    Quote Originally Posted by sburt911z View Post
    Similar issues...

    Bought my JKU new
    4.88’s
    37’s
    4” Teraflex lift
    Front and rear eLockers

    Suddenly at 69k started to run hot. Now it overheats on long gradual climbs at ~3k RPM’s

    Replaced: thermostat twice (196 and then a 180 degree), thermo housing, water pump, temp sensor, radiator cap (tried a new 16psi and a 18 psi), installed new aluminum radiator. Flushed twice and properly burped the cooling system each time

    Drives fine until steady uphill moderate climb then overheats instantly. Today overheated and boiled over out of overflow tank driving to lunch.

    Any suggestions from here are surely welcome!!!
    You prob still have air the system (heater core) post burping or a small leak somewhere allowing air in. I would suggest trying to burp it again first. If not then you could have a small clog in the radiator as posted above
    Jeep parts and accessories purchased through the following link will help support this forum and at no cost to you.
    RECOMMENDED JEEP PARTS & ACCESSORIES


    October 16, 2013, wednesday early evening, east of the pacific ocean, selectee for truly random and boring Parking lot photo of the moment grand platinum prize winner!

    2011 JK
    EVO Bolt-on Coilovers, EVO 1/4 pounder w/ stinger, 37" Cooper STT Pros, PR44, and some EVO stuff

    Awaiting install-
    On Order-
    Want list- Evo carrier and skins, PSC hydro assis

    jlwrangler.com

  9. #9
    Nothing but a Thing Angry Aussie's Avatar
    Join Date
    Jun 2013
    Location
    Austin
    Posts
    1,381
    Mine used to kind of do the same thing, but didn’t get hot enough to boil out anywhere. But it would get up there temperature wise driving up hills. I could never figure out why, I have a hood louver, vented wheel liners, etc and it would still get up to 250 up hills.

    Part of the issue was I had a coolant leak but even when the coolant levels were full it would still overheat.

    Long story short I put a mishimoto radiator in and I haven’t had an issue since. The Jeep doesn’t get hot going up hills anymore. I think the fact it holds 20-30% more coolant than a stock radiator helps.

    Hope you figure it out soon, I know how frustrating it is.


    Sent from my iPhone using WAYALIFE mobile app

  10. #10
    Old Timer longarmwj's Avatar
    Join Date
    Feb 2015
    Location
    Cumming, Ga
    Posts
    2,844
    Mines doing the same thing. It’ll go up to about the 3/4 mark on the gauge then go back down once the fan kicks on. Gonna try washing the radiator out to see if there’s any mud or anything gummed up there and go from there.


    Sent from my iPhone using WAYALIFE mobile app
    Captain Imachurity
    2003 WJ Build Thread
    2017 Gobi JKU Build Thread
    2016 Renegade Sport Build Thread

Page 1 of 2 12 LastLast

Similar Threads

  1. Overheating
    By BlackJKU08 in forum Jeep JK Wrangler
    Replies: 37
    Last Post: 07-20-2017, 06:30 AM
  2. Overheating 3.8
    By Lmoye22 in forum Jeep JK Wrangler
    Replies: 25
    Last Post: 10-08-2016, 06:44 PM
  3. 08 jk overheating
    By Bmans08jk in forum Jeep JK Wrangler
    Replies: 23
    Last Post: 08-16-2016, 09:57 PM
  4. Overheating when AC is on
    By seanb123 in forum Jeep JK Wrangler
    Replies: 6
    Last Post: 08-24-2015, 06:19 AM
  5. JK overheating
    By jorgelrod in forum Jeep JK Wrangler
    Replies: 31
    Last Post: 12-23-2014, 01:44 AM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
About us
“wayoflife” is a moniker that I’ve been using for 20 years now and I chose it because I think it does a great job of explaining, in simple terms, the passion I have for Jeeps and the Jeep way of life. This is a lifestyle that transcends age, gender and race as the only thing you need to be a part of it is a love for the outdoors, a desire to explore, a yearning to take on a challenge and a will to conquer it. Over the years, Cindy and I have attempted to capture the essence of this lifestyle through photographs and videos and share it with others around the world. And, this is how WAYALIFE was born.
Join us
WATCH OUR VIDEOS