Jeep wrangler overheating while driving

1997 jeep wrangler overheating or any vehicle overheatingCoolant antifreeze Jeep tj overheating issues explainedCauses of cars overheating while driving. Here's the evolution of the jeep wrangler08 jeep wrangler overheating problems new water pump thermostat 2014 toyota camry factory radio.

Big Warn winch, transmission cooler in front of radiator, and 8" driving lights up front too. My present TJ (the black one) has the same cooler (but for power steering) in front of the radiator and a Warn winch in front of the radiator. Never an overheating problem on either of them caused by those extra items positioned in front of the radiator.21 posts · Joined 2013. #24 · Jul 25, 2015. My 2014 JKUR-X Runs hot all the time. I think there are a lot of variables: Mods, tire size, gearing, additional equipment you are carrying. If I drive up I-70 out of Denver- a lot of uphil driving- at 65 mph and air condoning on, temp gauge goes 3/4+.JK14JK said: I have two 2014 Jeeps, both have coolant leaks in the same spot (Drivers side top corner under the shroud). One is worse than the other but both very small. You can see the purple stain from the coolant. Never leaves a puddle. There is the smell of coolant after some driving time.22 posts · Joined 2016. #1 · Feb 2, 2017. I've got a '16 JKU w/ Manual Tran and recently I've noticed a sloshing sound when I start up and move forwards or backwards. I can usually hear the sound for a few minutes. It sounds like like some kind of fluid or water is splashing around underneath the center console area.Jeep Wrangler overheating, white smoke while driving. I have a 2002 Jeep Wrangler. As I was driving today, I saw the temperature was reading 260 (the highest temp it will read). Pulled over to let it cool down. Noticed there were a few drops of coolant that came out of the radiator cap as I was waiting for it to cool down.He said 4.0 engines are well known for airlock problems, and that he wanted me to come in and have them use a special vacuum tool to take a vacuum on the coolant system and draw a vacuum on the empty coolant system, check to make sure it had no leaks and then to refill the system, using the vacuum to pull the coolant back into the …

the Jeep turns off while I'm driving, you can try to start it and it won't start and after about 15-20 minutes it starts normally. ... A forum community dedicated to Jeep Wrangler owners and enthusiasts. Come join the discussion about reviews, performance, trail riding, gear, suspension, tires, classifieds, troubleshooting, maintenance, for all ...HowStuffWorks heads to Tank Town USA to, you guessed it, see what it's like to drive a decommissioned military tank. Tank Town USA is just one of a few places in the country where ...To be more specific, below are twelve of the most common reasons behind Jeep overheating that you should be aware of: Insufficient or contaminated coolant. Problematic water pump. Faulty thermostat. Clogged radiator fins, cooling tubes, or coolant hose. Heater core problems. Defective blower motor or resistor.Have a jeep wrangler 2017 3.6l , over heating while driving speeds exceeding 40mph and any kind of incline. Fan seems to kick on very early and staying on high speed. Went to dealership, passed block test. ... 2016 Jeep Wrangler overheating changed the thermostat burped the lines but continues to over heat after about an hour of driving.Feb 2014. Summary: JEEP: VEHICLE'S AIR CONDITIONING SYSTEM IS LACKING COOLING OR THE ENGINE IS OVERHEATING AND NEEDS TO BE INSPECTED AND REPLACED, IF NECESSARY. MODEL 2014 WRANGLER. ( NHTSA ITEM NUMBER - 10055384 ) 2014 JKUR,teraflex 1.5 coil lift,Smittybilt XRC Front bumper,Warn VR10000-s,GE nighthawk LED headlights.

21 posts · Joined 2013. #24 · Jul 25, 2015. My 2014 JKUR-X Runs hot all the time. I think there are a lot of variables: Mods, tire size, gearing, additional equipment you are carrying. If I drive up I-70 out of Denver- a lot of uphil driving- at 65 mph and air condoning on, temp gauge goes 3/4+.Grew up driving Manual, New to wrangler and off-roading…LOVING IT Took my 2022 JL 4-door Rubicon off-roading last week, going up a couple of Sandy hills, after some little time on 4low got a message of clutch overheating and to release the clutch. Attached a picture from the hi Trying to...Apologize if this is the wrong section. I have a 2017 Jeep Wrangler Big Bear that's overheating. A while back I replaced the thermostat, no issues. Now it's overheat. On a cold start it will warm up to 245-250, then drop down to 220. If I'm going uphill it'll claim back up to 235-240 then drop...

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Help with overheating 4.0 Another 2014 jku overheating Relay overheating jku wrangler switched 240f Jeep wrangler nation philippines auto group. ... 2014 Jeep Wrangler Overheating While Driving. 17 Aug 2023; posts; Vincenza Rath; Jeep tj overheating issues explained All-new jeep wrangler drive Jeep overheating.Jeep Wrangler Clicking Noise While Driving -SOLVED - 4-Wheel Drive Guide All-new jeep wrangler drive Jeep idling overheats Help with overheating 4.0 5.3 overheating on highway in tj wranglerJeep 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.Steering wheel - left and right shaking or just shaking. Chassis - felt more in the seat. If you have gone off road and knocked a wheel weight off or have some mud, snow, or ice caked in a wheel this will happen. Like. 2. 21Sahara4xe Discussion starter. 35 posts · Joined 2021. #7 · Dec 20, 2023.rsmwrangler. On a nice cold morning on the highway at 70mph or so, you should be around 199-203F, but under load/traffic etc, the temp goes up because of the way the fans are programmed, so 230-240F is normal hot with the factory calibration, with my tune, my normal hot coolant temp is 212-216F.Have a jeep wrangler 2017 3.6l , over heating while driving speeds exceeding 40mph and any kind of incline. Fan seems to kick on very early and staying on high speed. Went to dealership, passed block test. ... 2016 Jeep Wrangler overheating changed the thermostat burped the lines but continues to over heat after about an hour of driving.

Jerry Bransford. 50621 posts · Joined 2005. #4 · Aug 27, 2021. X2, that problem is typically caused by a bad fan clutch causing the fan to not pull enough air through the radiator when you're idling/sitting still. Driving forces air through the radiator which is why yours is not overheating while driving.Engine overheating can be caused by a number of things such as low coolant levels, a faulty thermostat, or a failing coolant fan switch. As you may know the coolant fan switch helps to maintain the proper coolant temperature by turning on and off at specific temperature thresholds. When this switch is not working properly, this can cause the ...1 post · Joined 2011. #12 · Sep 23, 2011. jeep shuts off Repaired. I have a 99 grand cherokee that would shut off at very inappropriate times my problem was in the electrical plugs under the hood on the passenger side rear firewall. Remove battery neg cable and coolant overflow tank and you will see the 3 plug terminals.New kid in town, google shows this forum a lot so figured I try the experts here first. 2002 TJ 4.0L manual with 167k miles started overheating recently. Oddly, it would run normal temps for about 15min or so, then suddenly heat up and the Check Gauges light comes on. A minute or so later...My Jeep XJ 4.0 has 303,000 miles on it, passed emissions today, runs like new. I replaced the rod bearings and installed nw oil pump last year (just remove oil pan) and flushed Raidator. Rod bearing are usually the death for the 4.0, when you hear rattling on a hot start and have low oil pressure it's time. next is cracked head from overheating.Oh I’m not stressing. This is my fifth Jeep so I’m used to break downs. LOL My concerns are with an unproven engine. But after test driving it I was hooked on its pep. This thing will scoot. The torque is impressive and mpg around town 24. Got 28 driving it to Ohio over summer. As of this year etorque isn’t an option with the 2.0.Here are some of the most common reasons why your Jeep might shut off while driving and their solutions as well. 1. Faulty Air Flow. One of the most common reasons that can leave the engine of your Jeep to be running in bad shape or just not at all is a bad MAF (mass airflow sensor). The main job of the MAF sensor is to measure the …2015 Jeep jku 3.6 keeps overheating. I am at a loss. Okay whats going on is that after running the jeep it will fill up the reservoir with cooliant but the coolant doesn't return the the radiator. I did find there was a leak in the radiator. I also replaced upper and lower hoses, thermostat, waterpump, reservoir and 3 caps.Temperature drops while driving but rises while idling; Increasing speed decreases the temperatures; ... The overheating problem with the Jeep Wrangler is pretty typical. And in most cases, it is because of a coolant leak, which can happen due to a malfunctioning radiator, water pump, hoses, and others. ...

The deepest you can go with non-Rubicon axles is 5.13. 5.13 would be ideal for 33s and acceptable for 31s or 35s. Ideally with 35s you would go to 5.38, but 5.13 is the deepest you can go without an axle swap. If you think you'll end up with 33s or larger, go 5.13. That way you're future proofed.

If your car is overheating, you should definitely not drive it. This could be due to several factors, including low coolant levels or a faulty cooling system. Driving an overheated car puts additional strain on the engine, leading to further damage and costly repairs down the road. If your car has already started overheating, pull over as soon ...I replaced it because I had a constant overheating problem whenever idling, which in Houston traffic happens quite frequently. No problems at all when driving, just idling. Flushed out the whole system probably 4 or 5 times. Then replaced the thermostat, radiator, radiator cap, water pump, all hoses and fan clutch. Still it would overheat.The jeep wrangler may stall while driving but can be restarted. This issue may occur for various reasons, such as fuel pump failure, faulty sensors, or a damaged ignition switch. ... Temperature light: A red light on the dashboard indicates that the engine is overheating, which might require you to shut down the engine. Inspect The Engine.So far after recording every drive from all different speeds and types I found that on flat road my Jeep is running an average of 220-224 degrees. But will jump occasionally to 238 and the come back down. While I'm on the sand I saw it hit 240-245 with a high temp of 248. I know the jeep is working harder on the sand but it still seems a little ...The contact stated while driving approximately 50 MPH, the vehicle lost electrical power and stalled. No warning light was illuminated. The contact was made aware of NHTSA …About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright ...Jeep Wrangler Overheating While Driving. March 18, 2024, 2:35 pm ... Jeep JK Overheating at Highway Speeds – Causes and What to Do? – Off Road Quest. Blind-Spot Monitor w/Cross-Traffic Alert. The temperature of the engine when it is running normally should be somewhere between 195 and 220 Fahrenheit.From Wrangler to Gladiator, Jeep is one of the most iconic brands of 4×4 sports utility vehicles. They are good-looking and powerful, making them popular. Nonetheless, regardless of how high-performing …Whether you're looking to get a little extra work done in the evening or to relax with a movie, bringing your laptop to bed seems like it would provide comfort and convenience. In ...

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70 mph in 6th gear = 2614 rpms. Torque available to the rear wheels = 972 ft lbs. Available HP = 124. If this is not enough power to climb the hill or if I can not accelerate I am at 100% engine load or greater. Lets down shift to 5th. 2614 rpms in 5th gear = 57 mph. Torque available to the rear wheels = 1220 ft lbs.bonza. usually if your Jeep is overheating when driving at highway speeds it's caused by lack of water flow, ie plugged radiator or faulty pump or even stuck thermostat. overheating at slow speeds such as in traffic usually caused by interupted air flow thru radiator such as faulty fan clutch or radiator fins are blocked with crap.The Jeep Wrangler is a car that bills itself on its fearless character. Jeep has sought to portray the car as the ultimate vehicle for adventure seekers who love exploring the unch...An update on the Jeep Wrangler overheating issue and poor electrical fan operationIf you own a jeep wrangler and have experienced the frustrating situation of your vehicle suddenly dying while driving, only to restart after a few minutes, you may be dealing with a fuel delivery problem. Several issues can cause this alarming occurrence, including insufficient fuel pressure, a clogged fuel filter, or a faulty fuel pump.Components that can cause your Jeep Wrangler to overheat. Bad Thermostat. Bad Water Pump. Faulty Radiator Fan Clutch. Low Coolant level. Air block …Aggressive jerk while driving on highway uphill. I have an automatic 2014 rubicon 3.6l, I was driving up north today going uphill going about 65 then my Jeep jerked really hard, (my engine light came on as soon as this happened) kind of like red lining on 2nd gear, I couldn't accelerate even with the pedal on the floor.221 posts · Joined 2014. #1 · Feb 3, 2015. I have a 2006 TJRU with a plow. The plow is only used for my driveway, and occasionally I dig out a neighbor or 2. Heres the problem, when I travel with the plow on, the jeep overheats. It's only when traveling at speed. Say 40-55 or so. Never at idle, and never while plowing.2001 TJ 4.0 overheating sporadically. Help!!!! Long story, but want background included to help diagnose. Could use some advice. Jeep overheated on me a few times last year in summer. I ended up replacing radiator. Still had some occasional overheating issues, usually when idling.It should be stone cold until about 195 or 200 on the EVIC, and warm as the thermostat opens. If it starts to warm immediately, on a cold motor, that is diagnostic evidence of a stuck open thermostat. This is an older thread, you may not receive a response, and could be reviving an old thread. ….

Overheating issue. Hey guys, I have a 13 jku rubicon with 135k miles, 4” lift on 37’s, winch, etc. been fighting an overheating issue for a few months now. Only overheats on high load on the freeway so going up a grade and going 75+ mph. Or going up a winding steep grade going 45+. Temps will creep all the way up to 250 in some instances.My 99 Wrangler will over heat after about 20 minutes of driving. It will peg the guage very quickly, then after a couple of minutes, the guage will indicate a normal operating temperature. This cycle continues until I stop. When I do stop, I hear the radiator fluids boiling and sometimes my anti-freeze has sprayed the inside of my hood.This is a great place to start if you notice oil leaking from the valve covers. 2. Overheating. If your engine is overheating it'll smoke as the temperature rises. Compared to oil, the smell will be sweeter. The smoke will be a pure white color. Overheating is typically caused by: Bad Thermostat. Leaking Radiator.I have a 2017 jeep wrangler unlimited, we replaced the thermostat about a month or 2 ago, now it's overheating again while driving up hills or longer periods of time.. any ideas? Click to expand... I had a similar issue with my 2008 Wrangler a few years back where the temperature gauge would start creeping up when the outside temperature was ...Feb 2, 2021 · Wrangler: Overheating When Idling Causes and Solutions. 1. Low Coolant. While it seems counter intuitive, when your Wrangler is low on coolant may run ok with wind hitting the radiator, but when idling there’s just not enough coolant to properly cool the engine. Solution: Fill the radiator and coolant reservoir back up. I doubt the fan clutch will help high speed overheating. The air flow at speed should be plenty to cool the coolant in the radiator between thermostat cycles.I replaced my fan clutch on the 4.2 hoping it would help my low speed heat but no dice. Pull the plugs and see if they're light brown or super white.#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.A recurring common denominator is that running the Jeep at a stop for several minutes. Has to be more time than a traffic stop. While stopped, running idle, the dash goes dead. It's always been a warning sign that things are about to go bad - 2-3 minute warning.After that, for me, the 'trick' was to: 1) Make sure the coolant overflow bottle is filled to the max level. 2) With the engine cool, top up the radiator with coolant and install the radiator cap. 3) Start the engine. 4) Let the temp get to about 180F - 190F. 5) Shut off the engine and let cool for about 30 minutes.Step 4:You must inspect an electric motor cooling fan ,it will start with ignition key switch off, it has failed and needs to be replaced if the 2014 Jeep Wrangler fan motor does not spin freely . The electrical system operates the fan needs to be tested,If the fan motor “freewheels” that . Start the engine and then turn the air conditioner ... Jeep wrangler overheating while driving, 2014 JKU is overheating on the Highway after lift kit. I recently lifted my 14 JKU with a 3" lift and installed 35" tires and now it tends to overheat at highway speeds. I anticipated that the extra weight and bigger tires would cause the jeep to work a little harder, however while driving on the highway at about 70+mph, the engine temp …, Kane722 Discussion starter. 1 post · Joined 2018. #1 · Jun 18, 2018. I have an issue on our 2015 jeep wrangler high RPM's, when stopped at a light and ready to go i punched the gas and rpm goes high but jeep doesn't move its just reving up so i have to pull over shut the engine off and restart without any light coming on., Engine overheating in Jeep Wrangler is typically caused by a combination of factors, including insufficient coolant levels, coolant leaks from components like hoses or the radiator, a malfunctioning thermostat that fails to regulate coolant flow, a clogged radiator obstructing proper heat dissipation, faulty cooling fans not adequately cooling ..., Jeep running hot I have a 93 Jeep grand it is running hot but has never overheated. I have replaced the radiator, thermostat w/gasket, hoses, sending unit and fan clutch and water pump in the last 4 months. It is running at 210 while driving but at idle it will get to 225 to 235. I have no leaks my coolant is less than 50/50 I am completely ..., The noise happens all the time while the car is moving. It speeds up and slows down as the vehicle changes speed but is not affected by engine speed. I am unable to recreate the sound when the vehicle is not moving. I have tried the following. Jack up front of car and manually turn tire, but no noise. Jack up read of car and manually turn tires ..., Hi Everyone, This Tuesday i just went across the street to the store and while i parked, and idled, my Jeep began to overheat. Gauge all the way up H and notification in display. And the fan going like crazy. I have a 2014 Jeep Gand Cherokee Overland 4x4 3.6L. I immediately drove slowly back home (0.1mile) and parked it in our driveway., Reasons a Jeep Wrangler Is Overheating. Jeep Wrangler. The most common reasons a Jeep Wrangler is overheating are a coolant leak (water pump, radiator, hose etc.), the radiator fan, or a failed thermostat. 0 %. 41 % of the time it's the. Coolant leak (water pump, radiator, hose etc.) 0 %. 32 % of the time it's the., A bad thermostat is the most common cause of a heater only working when driving. 1. Low Coolant Level. It’s easy to verify your Wrangler’s coolant level by checking the overflow container. Always start with the easiest thing to check. Low coolant can cause your Jeep Wrangler’s heater not to work. To check the coolant level, locate the ..., Answered in 12 minutes by: Jeep Mechanic: Chris (aka-Moose) Chris (aka-Moose) Category: Jeep. Satisfied Customers: 84,015. Experience: 24 years of experience diagnosing & repairing. Verified. Howdy from Tennessee, I'm Chris aka Moose. I'm glad you've come here to get help., Hi guys. So I spent the last week pouring over every overheat issue post on multiple forums, most have no resolution (or OP didnt take the time to post). Heres my issue: 03 TJ 4.0 192k miles Auto 3.5'' lift 32's stock gearing. New Thermostat, cap, fan clutch, waterpump, radiator flush. Runs and drives fine, no CEL codes (evap codes but …, Apr 28, 2022. #21. Overheating at highway speeds usually indicates airflow is being blocked or diverted. Airflow can be blocked or diverted by anything mounted in front of the radiator such as winches, lights, grill inserts or stingers. Airflow can be blocked from exiting the engine compartment by aftermarket splash shields, incorrectly ..., Need help - JK overheating issue while on vacation. ... Driving hard uphill in a JKU with 3:21 gears will do that. AC on? ... Jeep Wrangler Forum. 9M posts 469K members Since 2005 A forum community dedicated to Jeep Wrangler owners and enthusiasts. Come join the discussion about reviews, performance, trail riding, gear, suspension, tires ..., Wrangler: Overheating When Idling Causes and Solutions. 1. Low Coolant. While it seems counter intuitive, when your Wrangler is low on coolant may run ok with wind hitting the radiator, but when idling there’s just not enough coolant to properly cool the engine. Solution: Fill the radiator and coolant reservoir back up., Overheating at Idle. Around a month ago I went mudding and got stuck, once I got out and confinued to go off-roading my Jeep overheated. After waiting for it to cool down I started it up and drove off, swapped the coil pack and spark plugs as they got wet. Yesterday I was in the line for McDonald (6 minutes maybe more) and the guage creeped up ..., 12 posts · Joined 2021. #1 · Sep 20, 2021. This winter my JKU started overheating going up I-70 towards the Eisenhower tunnel here in Colorado. From those not from these parts, its a long climb at 75+ mph at altitude. The Eisenhower goes right through the continental divide. My Jeep never had this issue before this winter, even on the …, Jeep ® Brand 4xe hybrid SUVs deliver legendary off-road capability. The Wrangler 4xe is our most capable Wrangler ever, delivering instant torque, exhilarating horsepower and hybrid performance to take you to distant destinations. Grand Cherokee 4xe also offers incredible capability, thanks to advanced and uncompromising 4x4 systems., Here are some of the most common reasons why your Jeep might shut off while driving and their solutions as well. 1. Faulty Air Flow. One of the most common reasons that can leave the engine of your Jeep to be running in bad shape or just not at all is a bad MAF (mass airflow sensor). The main job of the MAF sensor is to measure the …, 715 posts · Joined 2011. #7 · Feb 5, 2012. isolating the problem. Start the engine and let it warm up. As it is warming up, monitor the heater hoses. See if there is flow through the hoses. Run the heater fan full blast. See if there is flow through the heater core. If so, then the water pump is working., 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., Nov 8, 2021 · 6 posts · Joined 2021. #1 · Nov 8, 2021. I have a 2014 Grand Cherokee Summit 4x4. About a month ago the thermostat housing cracked, spraying coolant everywhere. While replacing that found that the oil cooler was also leaking oil. So the Jeep has a new thermostat and Oil Cooler, but now anytime the car gets above 3,000 RPMs. its starts to ... , 745 posts · Joined 2010. #13 · Feb 11, 2012. Yes the wrangler gauge runs about half. Most fords run about three eights. And you say the jap crap runs about 25%. These are all idiot lights and where the needle sets really doesn't reflect a tempature. It just reflects the norm., Jeep wrangler nation philippines auto group Help with overheating 4.0 Jeep wrangler clicking noise while driving -solved. All-New Jeep Wrangler Drive, Oct 10, 2017 · 951 posts · Joined 2016. #3 · Oct 10, 2017. 230 is definitely not overheating for the 3.6L, even seeing 240 is pretty typical. A lot of us (including myself) don't really like seeing the numbers so high, but there's no choice but to accept that the engineers designed the engine to operate at this temperature range. , Learn the top 10 reasons for Jeep Wrangler overheating and how to diagnose and fix the problem yourself. Skip to content. Off-Roading. Dirt Bikes Dirt Bike Riding Mastery Guide for Beginners; Trails ... The water pump continuously circulates coolant while driving. A worn impeller or leaking seal will reduce flow, allowing heat to ..., If you’re in the market for a used Jeep Wrangler, you’re in luck. These iconic off-road vehicles are known for their durability, versatility, and rugged style. Whether you’re an ou..., Jeep started to over heat .. found simple solution to the problem, You need to verify the temp sending unit is working and the electric fan. 2 reasons. 1) It overheated when you got home. This is usually because when running the clutch fan and driving are enough to cool the radiator. When you shut off it relies of the electric fan for a bit to stay cool after the clutch fan stops., JK14JK said: I have two 2014 Jeeps, both have coolant leaks in the same spot (Drivers side top corner under the shroud). One is worse than the other but both very small. You can see the purple stain from the coolant. Never leaves a puddle. There is the smell of coolant after some driving time., 6 posts · Joined 2015. #1 · Apr 25, 2015. I have a 2004 3.7L V6 Liberty that overheats after driving for about 20 minutes in about 70-80 degree weather. I have replaced a cracked radiator and a non functioning electric fan (relays checked out good) and went ahead and replaced the thermostat in the process. I hoped that would fix it but it ..., Your Jeep Renegade is equipped with a temperature gauge or warning light to help you detect overheating. Pay attention to this gauge or light while driving. The most common symptom of transmission overheating in your Renegade is the temperature light coming on. If your vehicle exhibits this symptom, it is crucial that you pull over promptly and ..., 2015 Jeep jku 3.6 keeps overheating. I am at a loss. Okay whats going on is that after running the jeep it will fill up the reservoir with cooliant but the coolant doesn't return the the radiator. I did find there was a leak in the radiator. I also replaced upper and lower hoses, thermostat, waterpump, reservoir and 3 caps., Alright guys, I need a hand. My 2014 JKU will randomly overheat up into temps of 240-250 driving the radiator fan crazy. JKU Spec’s. 186k miles. Oil changes every 5k. 3.5in lift on 35/12.5/20. Problem - overheating at idle and randomly throughout the day. Problem areas check., A bad thermostat is the most common cause of a heater only working when driving. 1. Low Coolant Level. It’s easy to verify your Wrangler’s coolant level by checking the overflow container. Always start with the easiest thing to check. Low coolant can cause your Jeep Wrangler’s heater not to work. To check the coolant level, locate the ...