Jeep jk running hot

Jul 8, 2021 · 62 posts · Joined 2017. #1 · Jul 7, 2021. I have been experiencing overheating 230-240 temps at highway speeds. I read the forum and replaced everything that I could find that would be causing the issue. Fan, radiator (went moshimoto), radiator tubes, thermostat (replaced with ripp), water pump, coolant, air filter, sc oil, engine oil.

Jeep jk running hot. The 3.6 is designed to run at these temperatures...why does everyone insist that it is too hot? In the old days, 180 or 190 was normal, but these aren't the old days …

U might jack it up and check how free the wheels rotate. That would create some heat depending on how bad the caliper was sticking without necessarily much associated smell especially if your running ceramic pads. Happened to our WJ twice, front left NAPA caliper frozen so only Centrics 4 me now.

The black wire is used in all electric circuits and is always the “hot” or live wire. It usually runs from the switch to the electrical load. Treat all wires with caution, because ...The 2012 and up Jeep JK wrangler fan on the 3.6L Pentastar has a few key characteristics: It is an Outrunner motor design. This doesn’t have much bearing on diagnosing problems, but it’s a key difference from the more traditional fan designs in the earlier Jeep JKs. The fan is a 3 wire design, which you can see if you detach the harness.May 22, 2011 · jeepersheart Discussion starter. 982 posts · Joined 2009. #1 · May 22, 2011. Noticed yesterday that the jeep was running really hot, hot enough actually to make the idiot chime tell me to look at the gauges. When I started actually paying close attention to it the needle was staying at the third little hash mark on the gauge (so technical right). Details. Effortlessly elevate your Jeep Wrangler's style and access with the Aries ActionTrac Powered Running Boards. These innovative running boards provide a convenient and safe step-up point while adding a touch of sophistication and functionality to your Jeep. When you open your door, the step automatically extends 8" to provide an easier ...Normally when the fan comes on after a few seconds/minutes of starting. There is either air in the coolant lines, or a stuck thermostat. There is a bleeder valve on the top of the thermostat. You may have to remove the air intake to get at it, then use a screw driver to turn the bleeder valve to release the air until the cooler starts spitting out.

TIMESTAMPS0:00 - Program Daytime Running Lights on Jeep Wrangler JK 130:16 - Set DRL Region (country)0:23 - Set DRL Location (lights a la fog/high beams/etc....May 20, 2014 · I recently replaced all the hoses and a 180-degree thermostat. we recently had a few cold days (teens on my morning commute) and the heat worked just fine the jeep was at 180 degrees the whole commute ( my Superchips tuner has the fan run temps down to 200,205 and high at 210). the fan will run on low for a bit when I run the defroster but it ... What also causes the JK/JKU's to run hot, especially the Pentastar, are the steel bumpers and winches we add on - this has a direct impact on the weight in front …A built in timer/relay causes the system to go Closed Loop after a few minutes of the engine running. Closed Loop just means that the O2 sensors are being monitored as an additional input to the fuel management system. Fault Codes about coolant temps & Closed Loop - dont mean that a specific temp is required to go Closed Loop ...1. Get Lifted – The SMART Way. Ground clearance, ground clearance, ground clearance. Being able to get over that obstacle can be the difference between finishing the trail and needing a tow out – and keeping your center of gravity low will help you keep your jeep shiny-side-up, should you get a little angle.711 posts · Joined 2019. #7 · Apr 22, 2020. Blend door actuator for sure for the no-heat-in-the-cabin deal, but the engine overheating seems far out for that. maybe a clogged heater core (might impede flow) Im dealing with no heat in cabin right now, except on the highest setting. Likely the actuator, but at only 17,000 miles is frustrating.2012 JKU runs hot at highway speeds. I have a 2012 JK doesn't overheat but runs hotter than normal at highway seeds. Replaced thermostat radiator water pump and new factory fan .. Even bought that funnel system for purging the air. Also checked for exhaust gasses in the fluid. Several time's.

Jeep runs hot while driving. I have a 2012 jeep jku sport, It runs hot only while driving, as soon as I park it and just let it idle it cooks down to around 208-215 and stays constant, while driving it has/will get as high as 245, but will fluctuate from 228-235. I have replaced the oil cooler (was leaking), the thermostat, and radiator cap.Buy SUORTO for Jeep JK Running Boards Drop Side Steps Compatible with 2007-2018 Jeep Wrangler JK 2 Doors, ... Jeep Wrangler JK Hot Sale . Visit the Store . Fender Liners for JEEP JK . Visit the Store . License Plate Frame for JK . Visit the Store . Next page. Product Description.In Stock. $237.99 $394.95. Westin HDX Drop Nerf Steps for 07-18 Jeep Wrangler JK. In Stock. $483.99. AMP Research PowerStep XL for 07-18 Jeep Wrangler JK Unlimited 4-Door. In Stock. $2,299.99. Go Rhino E-BOARD E1 Electric Running Board Kit for 07-18 Jeep Wrangler JK 2-Door.JKs, especially later models, do run hot for better emissions. I know I've seen 230 just sitting in traffic with zero load. I normally turn the A/C on which forces the Fan to …Faulty thermostat. Clogged radiator fins, cooling tubes, or coolant hose. Heater core problems. Defective blower motor or resistor. Bad fan or serpentine belt. Airlock in the cooling system. Stagnant antifreeze. Turbulent or insufficient airflow. Head gasket failure. Low oil levels.

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Gas supply is an essential utility that powers various appliances in our homes and businesses. Whether it’s heating, cooking, or running hot water, having a reliable gas supply is ...yeah, the middle is a bit high for the 3.6L especially if you are driving. But like you, normal temps for my 3.6 is just slightly above the 1/4 line. The only time when I see the temp gauge move is up to slightly below the 1/2 mark, and that us when im driving in a parking lot for like 20 minutes at low speed. The the fan kicks in and the temps ...2018 overheating issues. Hello all! Just recent purchased a used 2018 jk unlimited sport. It's has 98000 miles on it. I'm new new to the jeep community. Long story short the radiator fan is excessively loud and the jeep is over heating, I drove it about an hour and a half from the place I bought it from and now I can't even make it down the street.On hot days (temps in 90's plus), my Jeep would overheat while driving regardless of speed. Higher speeds didn't help cool it off. In older vehicles that had questionable cooling fans, you could just drive 50-60 and the airflow through radiator was enough to keep your engine happy. Not so in the JK. Particularly if you're running the A/C.

Normally when the fan comes on after a few seconds/minutes of starting. There is either air in the coolant lines, or a stuck thermostat. There is a bleeder valve on the top of the thermostat. You may have to remove the air intake to get at it, then use a screw driver to turn the bleeder valve to release the air until the cooler starts spitting out.JK running hot. my 2012 JK is running hotter than I think it should be. I took it to the dealer and they said its because the winch and spyder bumper. Then I took it to a local jeep expert ( Arabia's Overkill) and they said the winch would not affect the air circulation because its low and the bumper shouldn't either.A couple of weeks ago the electric radiator fan came on during a 2 hour drive and was very loud. After that day, that fan now comes on at full speed whenever driving more than about 10 miles on the highway. At full speed, its loud! I took it into the dealer and they replaced the TIPM computer and said it was fixed.Ok, while I was at the Easter Jeep Safari this year my engine started to randomly idle roughly. My engine normally idles around 675 rpm +/- about 25 rpm. I noticed that the rpm would pick up to about 720 then it suddenly drops off to about 500 rpm and when it does it shakes the whole jeep. this only happens when I'm stopped at stop lights/ …30818 posts · Joined 2002. #2 · Jul 2, 2012. It sounds like you are describing some sensor issues that occur when the the Jeep switches to closed loop operation. Test the O2 sensors, they can get old and slow to react. Typical O2 sensor service life is about 100,000-150,000 miles. Replace the coolant temperature sensor on the thermostat housing.JK running hot. My GF’s 2012 started getting hot this spring. Cel came on for oil pressure sensor a month or so before the heating issues started. Once it started getting hot, she had the oil filter housing and sensor replaced. That took care of the cel but the Jeep still gets hot. Her normal commute is 20 min to work and 30 or so to get home ...2015 JK Wrangler Cooling Fan Adjustments. Hi all. I searched but really haven't been able to find any info on this topic. The 3.6 in my JK was set up to run WAY too hot from the factory. Already had to replace the thermostat housing and radiator at 36k and a few months over 3 years. Anyway - now that I have a slightly cooler thermostat ...AUBURN HILLS, Mich., March 23, 2023 /PRNewswire/ -- Trail badge secured! The final grouping of Jeep® brand and Jeep Performance Parts by Mopar con... AUBURN HILLS, Mich., March 23,...2012 JKU runs hot at highway speeds. I have a 2012 JK doesn't overheat but runs hotter than normal at highway seeds. Replaced thermostat radiator water pump and new factory fan .. Even bought that funnel system for purging the air. Also checked for exhaust gasses in the fluid. Several time's.

Jtatt3822 Discussion starter. 2 posts · Joined 2020. #1 · Oct 17, 2020. I have had this Rubicon for several years never had any major problems. About a year ago I started hearing the radiator fan running on high at low speeds. I’ve asked about it when I’m getting the oil changed and regular maintenance, but no one seems to think it’s a ...

When the engine is hot and the fan clutch is HOT, from the hot air coming through the radiator, it should be engaged (very difficult to spin by hand). If the engine is cooled down and your fan clutch is cool, it should NOT be engaged (much easier to spin by hand). Since everything is cool, there is no reason to engage the clutch fan and thus ...711 posts · Joined 2019. #7 · Apr 22, 2020. Blend door actuator for sure for the no-heat-in-the-cabin deal, but the engine overheating seems far out for that. maybe a clogged heater core (might impede flow) Im dealing with no heat in cabin right now, except on the highest setting. Likely the actuator, but at only 17,000 miles is frustrating.Sinks—and running water in general—are wonderful things. Hot or cold water, whenever we want it, straight out of a tap conveniently located in our own homes? It’s pretty great. But...Whether you've got beef with hot dogs or love them, find out what makes the most mysterious of meats what it is. The hot dog has been much considered in American law. In fact, the ...The Jeep Grand Cherokee is a popular SUV that boasts impressive off-road capabilities and a comfortable ride for daily commutes. However, like any vehicle, it requires regular main...The pentastar does run on the hot side for better efficiency. Also keep in mind that the coolant temperature sensor is located at the left (driver) side engine head. Coolant is pushed by the pump through the engine block (around the cylinders) then through the heads and on to the oil heat exchanger, heater core and radiator via the …Overheating can be an expensive and potentially dangerous problem – if the engine is running too hot, it can cause permanent damage to your vehicle’s engine. In this article, we will discuss the causes of overheating in Jeep JKs at high speeds and some common fixes for the problem. What Causes Overheating in Jeep JKs at High Speeds?The pentastar does run on the hot side for better efficiency. Also keep in mind that the coolant temperature sensor is located at the left (driver) side engine head. Coolant is pushed by the pump through the engine block (around the cylinders) then through the heads and on to the oil heat exchanger, heater core and radiator via the …2. Faulty Thermostat. This is another relatively simple potential cause. Just like a regular thermostat, the thermostat in your Wrangler is in charge of reading the temperature of your Jeep’s engine. …Aug 27, 2022 · Jeep runs hot while driving. I have a 2012 jeep jku sport, It runs hot only while driving, as soon as I park it and just let it idle it cooks down to around 208-215 and stays constant, while driving it has/will get as high as 245, but will fluctuate from 228-235. I have replaced the oil cooler (was leaking), the thermostat, and radiator cap.

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3468 posts · Joined 2014. #14 · Jul 6, 2019. Normal temps should be in 200-220 range, 230-ish after strong acceleration or steep hill. I recently got to 240 (with a couple seconds at 244) while towing a heavy trailer uphill on the interstate in 89F weather - 4000 rpm in 3rd at 55 mph. So yeah, 250 isn’t normal.Radiator boiling/engine not overheating. I have a '12 Wrangler JK with 88k miles. Had the radiator flushed 15-20k miles ago, which started this problem again. Coolant empties in 3-7 days, but temp gauge reads normal. Happening whether I run the a/c or not, but happening more this summer.I replaced my radiator, hoses, and thermostat over the weekend. Afterward it was running slightly hot, but only about 212-215 so nothing terribly alarming. My girlfriend took the jeep the next day and it overheated on her way to work. The problem: when removing the thermostat, coolant will come out of the head.JKs, especially later models, do run hot for better emissions. I know I've seen 230 just sitting in traffic with zero load. I normally turn the A/C on which forces the Fan to stay on and the temp drops. So I could see 250 with a load, and any liquid is a pretty good load.Just got my new to me 2012 JK 2 days ago. Had it shipped it from Cali from a forum member I bought it off of. It has a Bully Dog GT tuner on it. Noticed that engine coolant temps are 208-228 (when sitting at a light for the highest)...avg of 210-215 while driving. However, its only 78 degrees outside here in Ft. Worth, TX.Whether you've got beef with hot dogs or love them, find out what makes the most mysterious of meats what it is. The hot dog has been much considered in American law. In fact, the ...The 1942-1944 Jeep entered World War II and became an instant success in battle. Learn about the versatility and war feats of the World War II jeep. Advertisement The 1942-1944 jee...2013 jk running hot above 3000 rpm. I can’t find any leaks in the system. I did try bleeding it today and no luck. Coolant is full an so is the reservoir is just below max. Never had any issues till I was towing the jet skis back from havasu a few weeks ago. Got to 3/4 on temp gauge. And now it likes to go above to 3/4 when I’m not babying it.3468 posts · Joined 2014. #14 · Jul 6, 2019. Normal temps should be in 200-220 range, 230-ish after strong acceleration or steep hill. I recently got to 240 (with a couple seconds at 244) while towing a heavy trailer uphill on the interstate in 89F weather - 4000 rpm in 3rd at 55 mph. So yeah, 250 isn’t normal. ….

It does nothing when the key is turned, besides turn the radio/ac on. Yesterday, I noticed “HOT OIL” come up on the dash. I checked oil level. It was fine. Temperature outside have been in the 90-100’s. I doubt that has anything to do with it. Oil has been changed. Engine coolant is good. Not running any codes. Could it be Starter ...3 posts · Joined 2017. #1 · May 25, 2017. I recently purchased a new 2017 Wrangler Unlimited Rubicon Recon edition. The headlights are great and perform similar to the HIDs on my Audi S5. These headlights appear to have integrated Daytime Running Lights (3 LEDs under the main LED unit) but I have not figured out how they operate.I replaced my radiator, hoses, and thermostat over the weekend. Afterward it was running slightly hot, but only about 212-215 so nothing terribly alarming. My girlfriend took the jeep the next day and it overheated on her way to work. The problem: when removing the thermostat, coolant will come out of the head.Hooke Road Wrangler JK Running Boards 4 Door Tube Side Steps Nerf Bar for 2007-2018 Jeep Wrangler JK Unlimited 4 Doors Only (Textured Black Heavy Duty) Visit the Hooke Road Store 4.5 4.5 out of 5 stars 181 ratings‎Jeep JK, 2007-2018 Jeep Wrangler JK 4-Door : Item Weight ‎58 Pounds : Manufacturer ‎Hooke Road : Item Weight ‎58 pounds : Product Dimensions ‎75.2 x 7.09 x 14.57 inches : Is Discontinued By Manufacturer ‎No : Manufacturer Part Number ‎QP.BXG-1062. Faulty Thermostat. This is another relatively simple potential cause. Just like a regular thermostat, the thermostat in your Wrangler is in charge of reading the temperature of your Jeep’s engine. …Nov 25, 2012 · Sort by Oldest first. S. SoK66. 1597 posts · Joined 2011. #2 · Nov 25, 2012. Let it cool off completely, then open the radiator & see if there's any coolant in it. If it's low there's a leak somewhere that needs to be fixed. Top the radiator up cold, then the overflow bottle when it's fully warmed up. It uses a special HOAT coolant, available ... Engine running hot (intermittent) Not terrible hot but hot enough that the fan runs on high. Happens more often on hot days but other times it’s just fine even pulling the fishing boat and trailer. This is new problem just the past 2 weeks. Thinking thermostat but decided to replace thermo and flush the whole cooling system at same time ...Maxx143 said: Jeeps have the ability to have DRLs, a Procal will turn them on for you. Had them on my '08 JK and now on my '14, even though the dealership said it wasn't equipped. As far as LED headlights, I'm running the JWS Evos and no issues, they just cannot be used on the high beam setting because they are too bright and not in …2018 overheating issues. Hello all! Just recent purchased a used 2018 jk unlimited sport. It's has 98000 miles on it. I'm new new to the jeep community. Long story short the radiator fan is excessively loud and the jeep is over heating, I drove it about an hour and a half from the place I bought it from and now I can't even make it down the street. Jeep jk running hot, The fan will run with the A/C on or off. It seems that there are more complaints from owners with 12 plus 3.6 JK's running hot, but in most instances it's normal. The variable speed fan is a better set up than prior year JK's. Beginning in 2012 with the 3.6 Chrysler went to a variable speed fan, basically low-med-high. A 3.6 will usually run at ..., 11585 posts · Joined 2011. #3 · Aug 29, 2017. I tried them on two different occasions, and they increased engine temps for me. I took them off and boxed them up. My 3.6L runs plenty hot, I didn't need to add to it. 2016 JK Rubicon Hard Rock Auto Trans. 2008 Jeep Liberty Auto Trans. 1988 E-150 4.9L 5 Speed Stick., Are you a proud owner of a Jeep? If so, you know that Jeeps are built for adventure and off-road capabilities. To keep your Jeep running at its best, it’s important to invest in hi..., The black wire is used in all electric circuits and is always the “hot” or live wire. It usually runs from the switch to the electrical load. Treat all wires with caution, because ..., On hot days (temps in 90's plus), my Jeep would overheat while driving regardless of speed. Higher speeds didn't help cool it off. In older vehicles that had questionable cooling fans, you could just drive 50-60 and the airflow through radiator was enough to keep your engine happy. Not so in the JK. Particularly if you're running the A/C., Doing maths, the engine oil will expand by about 0.3-0.4qt between room temp and running temp. Note: the difference between MIN/MAX on the dipstick is 1qt. Checking your oil at "operating temp + 5 mins" tells you the complete volume of the oil that the engine has when in operation., I own a 2016 Jeep Wrangler unlimited rubicon. I have a 4inch lift on 35x17 wheels. for about a year my engine has been running really hot. I recently had my head gaskets replaced along with my thermostat my radiator, my hoses, my water pump, my temp sensor, my timing belt,my coils and injectors. My engine is still running hot., May 20, 2014 · I recently replaced all the hoses and a 180-degree thermostat. we recently had a few cold days (teens on my morning commute) and the heat worked just fine the jeep was at 180 degrees the whole commute ( my Superchips tuner has the fan run temps down to 200,205 and high at 210). the fan will run on low for a bit when I run the defroster but it ... , The market's message these days is stick with the hot stocks and be cautious with the rest, writes stock trader Bob Byrne, who says the impressive runs in several big-tech name..., Hey guys, I have a question. I have a 2010 jku sport. 3.8 that’s running hot. I’ve flushed the radiator, new water pump, thermostat and housing, and new coolant temperature sensor. I’ve burped the system a few times to get out air, and replaced the radiator cap., It seems that there are more complaints from owners with 12 plus 3.6 JK's running hot, but in most instances it's normal. The variable speed fan is a better set up than prior year JK's. Beginning in 2012 with the 3.6 Chrysler went to a variable speed fan, basically low-med-high. A 3.6 will usually run at 210-230 with the AC off., Oct 13, 2018 · It was running hot before the install as well which JKs are known to do. There is a lot of heat being transferred to the coolant from when it is at the front of the block to the back that will still occur regardless of whatever radiator you have. Being that the factory temp sensor is at the back of the block, it will show the coolant at the ... , #1 · Aug 26, 2021. I have a 13 with 165k now, seems it may be running a little warmer than it had in the past. I never really looked at the evic temp just the gauge, seemed it used to …, 766 posts · Joined 2009. #11 · Sep 18, 2009. 4.2L's are supposed to run between 195* & 210*. If it's hotter than 210* & you can't think of anything else then consider this; Bucky's "engine runs hot" fix. 90YJ 98XJ. Like. This is an older thread, you may not receive a response, and could be reviving an old thread., Aug 4, 2021 · Low on power and running rough after warming up. My 98 TJ with the 2.5l has been acting up lately. It seems to run pretty normal when cold, but a few minutes after reaching normal running temp, it gradually seems to idle rougher and rougher, it's low on power and there's a drop in oil pressure. There was also a noticeable drip ftom the tail pipe. , Stephen Guilfoyle in his Market Recon column highlights the Nasdaq's "up" day streak, Thursday's hot day for semiconductor stocks, Biden's dragged-out..., Jeep runs hot up hills, or when driven with a lot of gas, especially on hot days. I have even managed to reproduce it on flats by flooring it. ... 2003 TJ Rubicon, 2" BDS Springs, 3"Bilsteins, JKS Discos, JKS 1.25" MML, JKS 1"BL, Warn M8000, SMF Bumper & Rockers, 254/85/R16 BFG KM2, Nth TT/Tranny skid/Oil pan skid, Tom Woods …, The Jeep Grand Cherokee is a popular SUV that boasts impressive off-road capabilities and a comfortable ride for daily commutes. However, like any vehicle, it requires regular main..., Dec 31, 2019 · As noted JK's with with the 3.6 run hot.. fan does not usually kick in till 226-228.. so if under load, steep hill for example, temps in the 230's can be expected.. Best advise is to make sure you have the least amount of stuff you can blocking the grill. sink the winch down in frame, remove grill inserts etc. , GreenRubi2015. 1109 posts · Joined 2011. #5 · Aug 14, 2023 (Edited) You still have air in your cooling system if your coolant temps are no longer running between 203F-210F operating temperature after opening up the cooling system to replace those parts. The factory service manual requires the use of an Airlift 550000 vacuum coolant filler on ..., The most common causes for AC blowing hot air in Jeep Wrangler are low or overcharged refrigerant, compressor malfunction, dirty condenser or evaporator coils, faulty blend door actuator, defective evaporator temperature sensor, bad AC pressure sensor, and bad fuse or relay. Less common causes are clogged expansion valve or …, As noted JK's with with the 3.6 run hot.. fan does not usually kick in till 226-228.. so if under load, steep hill for example, temps in the 230's can be expected.. Best advise is to make sure you have the least amount of stuff you can blocking the grill. sink the winch down in frame, remove grill inserts etc., The most common reason a Jeep will run hot is due to low oil or a coolant problem. Low coolant is usually because there is a leak somewhere in a hose, the reservoir, or the heater core. A failed engine thermostat or a blown head gasket are other common causes of overheating Jeeps. If allowed to overheat, the Jeep’s engine can sustain long ..., xbeatles4x. 13 posts · Joined 2012. #3 · Dec 8, 2012. The purpose of a thermostat is to let the car get up to operating temperature and then open up to not let it get any hotter. It is the optimal temperature for the car. If you run without a thermostat it would not let the car get up to operating temperature for a long while., 1314 posts · Joined 2015. #2 · Jun 6, 2017. It's dripping off your AC condenser, it is completely normal. On Jeep #8. 91 XJ 4.0 > 93 YJ "4 Angry Squirrels" > 95 ZJ "Magnum" Limited > 07 JK Sahara > 15 JKU Sport S > 16 JK Rubicon traded in for my fiance's commuter and gave her renegade to her Parents to help them out., Water Pump Failure: A leaking water pump will result in a drop in the coolant level. but when it actually causes your Jeep Wrangler Overheating, it is more likely to be due to a failure of the water pump. The pump is driven by the timing belt which means when there is a problem with one of them, you are likely to have problems with the other one., Jtatt3822 Discussion starter. 2 posts · Joined 2020. #1 · Oct 17, 2020. I have had this Rubicon for several years never had any major problems. About a year ago I started hearing the radiator fan running on high at low speeds. I’ve asked about it when I’m getting the oil changed and regular maintenance, but no one seems to think it’s a ..., 8951 posts · Joined 2008. #3 · Nov 14, 2016. If there's a slight hissing sound at times when the A/C is cycling that's normal. Sometimes it's more evident with high humidity. All JK's A/C will make that sound at any given time, the owner might not notice it and some will make more of a hissing sound. If it starts to get noticeably warm and ..., Jun 21, 2016 · Does anyone know what the operating temperature of a 2015 JK is? The reason is, I think mine is running hot. The analog gauss is dead in the middle but the digital gauge (via the display thru the steering wheel) is hitting 230. now from passed experiences, I seen the analog gauge move from centerline (1/2) to 3rd dot , 870 posts · Joined 2015. #2 · Apr 6, 2020. Welcome to the world of Jeep emisions, they like to run the engine hot. Try leaving the AC on it will turn the engine fan on Low and keep coolant temps down. The 35's and 3.73 is putting a strain on the motor too making it work harder to keep up to speed. 2016 Red Rock #31., Proudly sponsored by Enginetech https://enginetech.com/Engine rebuild kit I used on my 4.0L rebuild: https://amzn.to/2WuNdbuIf my videos have helped you sav..., A built in timer/relay causes the system to go Closed Loop after a few minutes of the engine running. Closed Loop just means that the O2 sensors are being monitored as an additional input to the fuel management system. Fault Codes about coolant temps & Closed Loop - dont mean that a specific temp is required to go Closed Loop ..., 2014 JK w/ 97,000 miles. 3.6 penstar ... Long story short, she fired right up and ran fine. Once I took her for a test ride the temp gauge went straight past the overheating mark. I turned around came home, popped the hood and it didn’t “seem” all that hot. I could touch the top radiator hose and the cap without issue.